1217
1217 is a year in the 13th century. The French invasion of England was defeated at Lincoln and at sea off Sandwich (England).
- Odd
- Prime
Where 1217 fits
Why 1217 is special
1217 has a profile because of what happened in it rather than because of any property of the number: the French invasion of England was defeated at Lincoln and at sea off Sandwich (England).
1217 is part of
Factors & digit properties
- Divisors (2)
- 1, 1217
- Prime factorisation
- 1217
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 1217
- Scientific notation
- 1.217 × 10^3
Roman numerals
M C C X V I I
Binary
1 0 0 1 1 0 0 0 0 0 1
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,217
Octal
2 3 0 1
2 × 512 + 3 × 64 + 0 × 8 + 1 × 1 = 1,217
Hexadecimal
4 c 1
4 × 256 + c × 16 + 1 × 1 = 1,217
Read as powers of two: 1,024 + 128 + 64 + 1 = 1,217.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 1 hobble, 7 strokes
1 × 1,000 + 2 × 100 + 1 × 10 + 7 × 1 = 1,217. 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), 1 corner wedge + 7 vertical wedges (units place)
20 × 60 + 17 = 1217. 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
Related numbers & connections
1217 is a year in the 13th century, in the 1210s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1217, the French invasion of England was defeated at Lincoln and at sea off Sandwich (England).
DocumentedHistoryGeography: EnglandPeriod: 1217
Common questions
Is 1217 a prime number?
Yes, 1217 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1217?
The factors of 1217 are 1, 1217.
What is 1217 in Roman numerals?
1217 in Roman numerals is MCCXVII.
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