1111
1111 is a year in the 12th century. Al-Ghazali died, having turned much of Islamic theology against the philosophers (Persia).
- Odd
- Composite
Where 1111 fits
Why 1111 is special
1111 has a profile because of what happened in it rather than because of any property of the number: al-Ghazali died, having turned much of Islamic theology against the philosophers (Persia).
1111 is part of
Factors & digit properties
- Divisors (4)
- 1, 11, 101, 1111
- Prime factorisation
- 11 × 101
- Digit sum
- 4
- Digital root
- 4
Representations
- Decimal
- 1111
- Scientific notation
- 1.111 × 10^3
Roman numerals
M C X I
Binary
1 0 0 0 1 0 1 0 1 1 1
1 × 1,024 + 0 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,111
Octal
2 1 2 7
2 × 512 + 1 × 64 + 2 × 8 + 7 × 1 = 1,111
Hexadecimal
4 5 7
4 × 256 + 5 × 16 + 7 × 1 = 1,111
Read as powers of two: 1,024 + 64 + 16 + 4 + 2 + 1 = 1,111.
In historical numeral systems
Egyptian
1 lotus, 1 coil of rope, 1 hobble, 1 stroke
1 × 1,000 + 1 × 100 + 1 × 10 + 1 × 1 = 1,111. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 8 vertical wedges (sixties place), 3 corner wedges + 1 vertical wedge (units place)
18 × 60 + 31 = 1111. 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
- Palindromic number
- Deficient number
- Repdigit
- Semiprime
Related numbers & connections
1111 is a year in the 12th century, in the 1110s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1111, al-Ghazali died, having turned much of Islamic theology against the philosophers (Persia).
DocumentedHistoryGeography: PersiaPeriod: 1111
Common questions
Is 1111 a prime number?
No, 1111 is not prime.
What are the factors of 1111?
The factors of 1111 are 1, 11, 101, 1111.
What is 1111 in Roman numerals?
1111 in Roman numerals is MCXI.
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