2151
The YM2151 is the FM sound chip behind many arcade machines.
- Odd
- Composite
Where 2151 fits
Why 2151 is special
It gave 1980s arcade cabinets a sound that home consoles could not match, which was part of what people paid a coin for.
2151 is part of
Factors & digit properties
- Divisors (6)
- 1, 3, 9, 239, 717, 2151
- Prime factorisation
- 3^2 × 239
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 2151
- Scientific notation
- 2.151 × 10^3
Roman numerals
M M C L I
Binary
1 0 0 0 0 1 1 0 0 1 1 1
1 × 2,048 + 0 × 1,024 + 0 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 2,151
Octal
4 1 4 7
4 × 512 + 1 × 64 + 4 × 8 + 7 × 1 = 2,151
Hexadecimal
8 6 7
8 × 256 + 6 × 16 + 7 × 1 = 2,151
Read as powers of two: 2,048 + 64 + 32 + 4 + 2 + 1 = 2,151.
In historical numeral systems
Egyptian
2 lotuses, 1 coil of rope, 5 hobbles, 1 stroke
2 × 1,000 + 1 × 100 + 5 × 10 + 1 × 1 = 2,151. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 corner wedges + 5 vertical wedges (sixties place), 5 corner wedges + 1 vertical wedge (units place)
35 × 60 + 51 = 2151. Places are separated by a space on the tablet, with the higher place written first.
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
- Harshad (Niven) number
Related numbers & connections
Both are Yamaha FM chips; one defined arcade sound and the other a home console's.
View 2612 →OPL2 brought FM synthesis to PC sound cards, where compatibility with it became a purchasing requirement.
View 3812 →Media & popular culture
The YM2151 provides eight FM channels with four operators each and was widely used in arcade hardware and in early Japanese computer sound options.
DocumentedMedia & popular culturePeriod: 1984–
Common questions
Is 2151 a prime number?
No, 2151 is not prime.
What are the factors of 2151?
The factors of 2151 are 1, 3, 9, 239, 717, 2151.
What is 2151 in Roman numerals?
2151 in Roman numerals is MMCLI.
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