193
193 is the number of member states of the United Nations.
- Odd
- Prime
Where 193 fits
Why 193 is special
It is the closest thing there is to an official count of the world's countries, and it is not the figure most people give. The commonly quoted 195 adds the two permanent observer states, the Holy See and Palestine; other counts add territories that field their own Olympic teams. Which number is right depends entirely on what is being asked.
Same number, different meanings
How 193 is understood across different contexts — never implying one meaning because of another.
- Mathematics
It is the closest thing there is to an official count of the world's countries, and it is not the figure most people give. The commonly quoted 195 adds the two permanent observer states, the Holy See and Palestine; other counts add territories that field their own Olympic teams. Which number is right depends entirely on what is being asked.
- Technology & computing
The Suez Canal is 193 kilometres (Egypt, since 1869). It has no locks, because the Mediterranean and the Red Sea are close enough in level not to need them — which is why it can be widened but not easily deepened.
- Law & regulation
There are 193 member states of the United Nations (worldwide, since South Sudan joined in 2011). The count people mean by 'how many countries are there' is usually this one plus the two permanent observer states, the Holy See and Palestine — which is where the commonly quoted 195 comes from.
193 is part of
Factors & digit properties
- Divisors (2)
- 1, 193
- Prime factorisation
- 193
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 193
- Scientific notation
- 1.930 × 10^2
Roman numerals
C X C I I I
CXCIII uses the subtractive pair XC: ten before a hundred — a hundred minus ten.
Binary
1 1 0 0 0 0 0 1
1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 193
Octal
3 0 1
3 × 64 + 0 × 8 + 1 × 1 = 193
Hexadecimal
c 1
c × 16 + 1 × 1 = 193
Read as powers of two: 128 + 64 + 1 = 193.
In historical numeral systems
Egyptian
1 coil of rope, 9 hobbles, 3 strokes
1 × 100 + 9 × 10 + 3 × 1 = 193. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 vertical wedges (sixties place), 1 corner wedge + 3 vertical wedges (units place)
3 × 60 + 13 = 193. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
rho, then koppa, then gamma, marked as a numeral
rho-koppa-gamma + keraia
rho + koppa + gamma written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
qof, then tsadi, then gimel
qof-tsadi-gimel
qof (100) + tsadi (90) + gimel (3) = 193, written in descending order.
Maya
1 bar + 4 dots (upper, twenties place) over 2 bars + 3 dots (lower, units place)
9 × 20 + 13 = 193. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Happy number
- Lucky number (mathematical sieve)
- Twin prime
Related numbers & connections
193 appears in Numbers in law and public systems, the topic covering numbers that carry a documented law or public-systems fact.
Numbers Around Us
- appears inLaw and public systems
why?
Strength 0.50, confidence "high".
- appears inTransport
why?
Strength 0.50, confidence "high".
Technology & computing
The Suez Canal is 193 kilometres (Egypt, since 1869). It has no locks, because the Mediterranean and the Red Sea are close enough in level not to need them — which is why it can be widened but not easily deepened.
DocumentedTechnology & computingGeography: Egypt, since 1869
Law & regulation
There are 193 member states of the United Nations (worldwide, since South Sudan joined in 2011). The count people mean by 'how many countries are there' is usually this one plus the two permanent observer states, the Holy See and Palestine — which is where the commonly quoted 195 comes from.
DocumentedLaw & regulationGeography: worldwide, since South Sudan joined in 2011
Common questions
Is 193 a prime number?
Yes, 193 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 193?
The factors of 193 are 1, 193.
What is 193 in Roman numerals?
193 in Roman numerals is CXCIII. XC is subtractive: ten before a hundred — a hundred minus ten. Written additively it would be CLXXXXIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026