1241
1241 is the year Mongol armies reached central Europe.
- Odd
- Composite
Where 1241 fits
Why 1241 is special
They defeated Polish and Hungarian forces within two days of each other and then withdrew on news of the Great Khan's death. Europe was spared by a succession crisis rather than by any defence.
1241 is part of
Factors & digit properties
- Divisors (4)
- 1, 17, 73, 1241
- Prime factorisation
- 17 × 73
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 1241
- Scientific notation
- 1.241 × 10^3
Roman numerals
M C C X L I
MCCXLI uses the subtractive pair XL: ten before fifty — fifty minus ten.
Binary
1 0 0 1 1 0 1 1 0 0 1
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,241
Octal
2 3 3 1
2 × 512 + 3 × 64 + 3 × 8 + 1 × 1 = 1,241
Hexadecimal
4 d 9
4 × 256 + d × 16 + 9 × 1 = 1,241
Read as powers of two: 1,024 + 128 + 64 + 16 + 8 + 1 = 1,241.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 4 hobbles, 1 stroke
1 × 1,000 + 2 × 100 + 4 × 10 + 1 × 1 = 1,241. 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), 4 corner wedges + 1 vertical wedge (units place)
20 × 60 + 41 = 1241. 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
1241 is a year in the 13th century, in the 1240s.
Mongol armies withdrew from Europe in 1241 on news of a Great Khan's death, and their invasions of Japan in 1274 were destroyed by typhoons. Both advances stopped for reasons unrelated to the defence.
View 1274 →Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
Other connections
- contrasts with1274
why?
Strength 0.50, confidence "high".
History
In 1241, Mongol armies destroyed Polish and Hungarian forces at Legnica and Mohi within two days of each other (Central Europe).
DocumentedHistoryGeography: Central EuropePeriod: 1241Mongol forces destroyed European armies at Legnica and Mohi in April 1241 and then turned back when Ögedei Khan died. Nothing in Europe had stopped them.
DocumentedHistoryGeography: Poland and HungaryPeriod: 1241
Common questions
Is 1241 a prime number?
No, 1241 is not prime.
What are the factors of 1241?
The factors of 1241 are 1, 17, 73, 1241.
What is 1241 in Roman numerals?
1241 in Roman numerals is MCCXLI. XL is subtractive: ten before fifty — fifty minus ten. Written additively it would be MCCXXXXI, 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: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026