1255
1255 is a year in the 13th century. Henry III's acceptance of the Sicilian crown for his son led to the debts that provoked the barons (England).
- Odd
- Composite
Where 1255 fits
Why 1255 is special
1255 has a profile because of what happened in it rather than because of any property of the number: Henry III's acceptance of the Sicilian crown for his son led to the debts that provoked the barons (England).
1255 is part of
Factors & digit properties
- Divisors (4)
- 1, 5, 251, 1255
- Prime factorisation
- 5 × 251
- Digit sum
- 13
- Digital root
- 4
Representations
- Decimal
- 1255
- Scientific notation
- 1.255 × 10^3
Roman numerals
M C C L V
Binary
1 0 0 1 1 1 0 0 1 1 1
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,255
Octal
2 3 4 7
2 × 512 + 3 × 64 + 4 × 8 + 7 × 1 = 1,255
Hexadecimal
4 e 7
4 × 256 + e × 16 + 7 × 1 = 1,255
Read as powers of two: 1,024 + 128 + 64 + 32 + 4 + 2 + 1 = 1,255.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 5 hobbles, 5 strokes
1 × 1,000 + 2 × 100 + 5 × 10 + 5 × 1 = 1,255. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
2 corner wedges (sixties place), 5 corner wedges + 5 vertical wedges (units place)
20 × 60 + 55 = 1255. 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
- Semiprime
Related numbers & connections
1255 is a year in the 13th century, in the 1250s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1255, Henry III's acceptance of the Sicilian crown for his son led to the debts that provoked the barons (England).
DocumentedHistoryGeography: EnglandPeriod: 1255
Common questions
Is 1255 a prime number?
No, 1255 is not prime.
What are the factors of 1255?
The factors of 1255 are 1, 5, 251, 1255.
What is 1255 in Roman numerals?
1255 in Roman numerals is MCCLV.
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