1163
1163 is the year construction began on Notre-Dame de Paris.
- Odd
- Prime
Where 1163 fits
Why 1163 is special
It took nearly two centuries to complete. The 2019 fire destroyed the roof timbers, an oak forest's worth of thirteenth-century wood known as la forêt.
1163 is part of
Factors & digit properties
- Divisors (2)
- 1, 1163
- Prime factorisation
- 1163
- Digit sum
- 11
- Digital root
- 2
Representations
- Decimal
- 1163
- Scientific notation
- 1.163 × 10^3
Roman numerals
M C L X I I I
Binary
1 0 0 1 0 0 0 1 0 1 1
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 1,163
Octal
2 2 1 3
2 × 512 + 2 × 64 + 1 × 8 + 3 × 1 = 1,163
Hexadecimal
4 8 b
4 × 256 + 8 × 16 + b × 1 = 1,163
Read as powers of two: 1,024 + 128 + 8 + 2 + 1 = 1,163.
In historical numeral systems
Egyptian
1 lotus, 1 coil of rope, 6 hobbles, 3 strokes
1 × 1,000 + 1 × 100 + 6 × 10 + 3 × 1 = 1,163. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 9 vertical wedges (sixties place), 2 corner wedges + 3 vertical wedges (units place)
19 × 60 + 23 = 1163. 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
Notre-Dame began in 1163 and Cologne Cathedral in 1248. Cologne stood unfinished for four centuries and was completed from surviving medieval plans in 1880.
View 1248 →Numbers Around Us
- appears alongside1248
why?
Strength 0.50, confidence "high".
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1163, construction began on Notre-Dame de Paris (France).
DocumentedHistoryGeography: FrancePeriod: 1163Notre-Dame's medieval roof used around 1,300 oaks and was known as la forêt. It burned in 2019, destroying timber that had been in place for eight centuries.
DocumentedHistoryGeography: Paris, FrancePeriod: 1163
Common questions
Is 1163 a prime number?
Yes, 1163 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1163?
The factors of 1163 are 1, 1163.
What is 1163 in Roman numerals?
1163 in Roman numerals is MCLXIII.
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