203
203 is a Bell number.
- Odd
- Composite
Where 203 fits
Why 203 is special
Bell numbers count the ways a set can be partitioned into groups. Five items can be grouped 52 ways and six items 203, which is why splitting a small team into subgroups has more options than people expect.
203 is part of
Factors & digit properties
- Divisors (4)
- 1, 7, 29, 203
- Prime factorisation
- 7 × 29
- Digit sum
- 5
- Digital root
- 5
Representations
- Decimal
- 203
- Scientific notation
- 2.030 × 10^2
Roman numerals
C C I I I
Binary
1 1 0 0 1 0 1 1
1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 203
Octal
3 1 3
3 × 64 + 1 × 8 + 3 × 1 = 203
Hexadecimal
c b
c × 16 + b × 1 = 203
Read as powers of two: 128 + 64 + 8 + 2 + 1 = 203.
In historical numeral systems
Egyptian
2 coils of rope, 3 strokes
2 × 100 + 3 × 1 = 203. 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), 2 corner wedges + 3 vertical wedges (units place)
3 × 60 + 23 = 203. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sigma, then gamma, marked as a numeral
sigma-gamma + keraia
sigma + gamma written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
resh, then gimel
resh-gimel
resh (200) + gimel (3) = 203, written in descending order.
Maya
2 bars (upper, twenties place) over 3 dots (lower, units place)
10 × 20 + 3 = 203. 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
- Semiprime
Mathematics
203 is the number of ways to partition six items into groups. The count grows explosively — ten items have 115,975 partitions — which is why team-splitting problems resist enumeration quickly.
DocumentedMathematics
Common questions
Is 203 a prime number?
No, 203 is not prime.
What are the factors of 203?
The factors of 203 are 1, 7, 29, 203.
What is 203 in Roman numerals?
203 in Roman numerals is CCIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026