1139
1139 is a year in the 12th century. Afonso Henriques took the title of king, and Portugal's borders have changed less since than almost any in Europe (Portugal).
- Odd
- Composite
Where 1139 fits
Why 1139 is special
1139 has a profile because of what happened in it rather than because of any property of the number: Afonso Henriques took the title of king, and Portugal's borders have changed less since than almost any in Europe (Portugal).
1139 is part of
Factors & digit properties
- Divisors (4)
- 1, 17, 67, 1139
- Prime factorisation
- 17 × 67
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 1139
- Scientific notation
- 1.139 × 10^3
Roman numerals
M C X X X I X
MCXXXIX uses the subtractive pair IX: one before ten — ten minus one.
Binary
1 0 0 0 1 1 1 0 0 1 1
1 × 1,024 + 0 × 512 + 0 × 256 + 0 × 128 + 1 × 64 + 1 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,139
Octal
2 1 6 3
2 × 512 + 1 × 64 + 6 × 8 + 3 × 1 = 1,139
Hexadecimal
4 7 3
4 × 256 + 7 × 16 + 3 × 1 = 1,139
Read as powers of two: 1,024 + 64 + 32 + 16 + 2 + 1 = 1,139.
In historical numeral systems
Egyptian
1 lotus, 1 coil of rope, 3 hobbles, 9 strokes
1 × 1,000 + 1 × 100 + 3 × 10 + 9 × 1 = 1,139. 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), 5 corner wedges + 9 vertical wedges (units place)
18 × 60 + 59 = 1139. 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
1139 is a year in the 12th century, in the 1130s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1139, Afonso Henriques took the title of king, and Portugal's borders have changed less since than almost any in Europe (Portugal).
DocumentedHistoryGeography: PortugalPeriod: 1139
Common questions
Is 1139 a prime number?
No, 1139 is not prime.
What are the factors of 1139?
The factors of 1139 are 1, 17, 67, 1139.
What is 1139 in Roman numerals?
1139 in Roman numerals is MCXXXIX. IX is subtractive: one before ten — ten minus one. Written additively it would be MCXXXVIIII, 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