103
103 is the ambulance number across much of the former Soviet Union.
- Odd
- Prime
Where 103 fits
Why 103 is special
103 completes a numbering scheme designed in the Soviet era and still in use: 101 fire, 102 police, 103 ambulance, 104 gas leak. The gas-leak line is the unusual one — few countries treat a domestic gas emergency as a separate three-digit service, and its presence reflects how widely piped gas was distributed.
Same number, different meanings
How 103 is understood across different contexts — never implying one meaning because of another.
- Mathematics
103 completes a numbering scheme designed in the Soviet era and still in use: 101 fire, 102 police, 103 ambulance, 104 gas leak. The gas-leak line is the unusual one — few countries treat a domestic gas emergency as a separate three-digit service, and its presence reflects how widely piped gas was distributed.
- History
The 101/102/103/104 assignment — fire, police, ambulance, gas leak — dates from Soviet telephony and survives across the successor states. The separate gas-leak line is the distinctive part: few countries give a domestic gas emergency its own three-digit number, and its presence reflects how comprehensively piped gas was installed.
- Science
Lawrencium honours Ernest Lawrence, who built the cyclotron. Every synthetic element depends on accelerators, so the name credits the machine that made the whole class possible.
103 is part of
Factors & digit properties
- Divisors (2)
- 1, 103
- Prime factorisation
- 103
- Digit sum
- 4
- Digital root
- 4
Representations
- Decimal
- 103
- Scientific notation
- 1.030 × 10^2
Roman numerals
C I I I
Binary
1 1 0 0 1 1 1
1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 103
Octal
1 4 7
1 × 64 + 4 × 8 + 7 × 1 = 103
Hexadecimal
6 7
6 × 16 + 7 × 1 = 103
Read as powers of two: 64 + 32 + 4 + 2 + 1 = 103.
In historical numeral systems
Egyptian
1 coil of rope, 3 strokes
1 × 100 + 3 × 1 = 103. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 vertical wedge (sixties place), 4 corner wedges + 3 vertical wedges (units place)
1 × 60 + 43 = 103. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
rho, then gamma, marked as a numeral
rho-gamma + keraia
rho + 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 gimel
qof-gimel
qof (100) + gimel (3) = 103, written in descending order.
Maya
1 bar (upper, twenties place) over 3 dots (lower, units place)
5 × 20 + 3 = 103. 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
- Twin prime
Related numbers & connections
Two thirds of a single Soviet-era scheme still in use across the successor states: 101 fire, 102 police, 103 ambulance, 104 gas leak. The numbers are learned as a set, and the separate gas line is what distinguishes the scheme from most others.
View 102 →Numbers Around Us
- appears alongside102
why?
Strength 0.50, confidence "high".
History
The 101/102/103/104 assignment — fire, police, ambulance, gas leak — dates from Soviet telephony and survives across the successor states. The separate gas-leak line is the distinctive part: few countries give a domestic gas emergency its own three-digit number, and its presence reflects how comprehensively piped gas was installed.
DocumentedHistoryGeography: Russia, Ukraine, Kazakhstan and other CIS states
Science
Lawrencium honours Ernest Lawrence, who built the cyclotron. Every synthetic element depends on accelerators, so the name credits the machine that made the whole class possible.
DocumentedScienceComet 103P/Hartley 2 was visited by the EPOXI mission in 2010. Its carbon dioxide-driven jets produced activity disproportionate to its size, with icy chunks visible around the nucleus.
DocumentedSciencePeriod: 1986–
Common questions
Is 103 a prime number?
Yes, 103 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 103?
The factors of 103 are 1, 103.
What is 103 in Roman numerals?
103 in Roman numerals is CIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 3 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026