1209
1209 is a year in the 13th century. Scholars leaving Oxford settled at Cambridge, founding its university (England).
- Odd
- Composite
Where 1209 fits
Why 1209 is special
1209 has a profile because of what happened in it rather than because of any property of the number: scholars leaving Oxford settled at Cambridge, founding its university (England).
1209 is part of
Factors & digit properties
- Divisors (8)
- 1, 3, 13, 31, 39, 93, 403, 1209
- Prime factorisation
- 3 × 13 × 31
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 1209
- Scientific notation
- 1.209 × 10^3
Roman numerals
M C C I X
MCCIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 0 0 1 0 1 1 1 0 0 1
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,209
Octal
2 2 7 1
2 × 512 + 2 × 64 + 7 × 8 + 1 × 1 = 1,209
Hexadecimal
4 b 9
4 × 256 + b × 16 + 9 × 1 = 1,209
Read as powers of two: 1,024 + 128 + 32 + 16 + 8 + 1 = 1,209.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 9 strokes
1 × 1,000 + 2 × 100 + 9 × 1 = 1,209. 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), 9 vertical wedges (units place)
20 × 60 + 9 = 1209. 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
- Lucky number (mathematical sieve)
Related numbers & connections
1209 is a year in the 13th century, in the 1200s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1209, scholars leaving Oxford settled at Cambridge, founding its university (England).
DocumentedHistoryGeography: EnglandPeriod: 1209
Common questions
Is 1209 a prime number?
No, 1209 is not prime.
What are the factors of 1209?
The factors of 1209 are 1, 3, 13, 31, 39, 93, 403, 1209.
What is 1209 in Roman numerals?
1209 in Roman numerals is MCCIX. IX is subtractive: one before ten — ten minus one. Written additively it would be MCCVIIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
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