1223
1223 is a year in the 13th century. The Franciscan rule was confirmed in writing by Honorius III (Europe).
- Odd
- Prime
Where 1223 fits
Why 1223 is special
1223 has a profile because of what happened in it rather than because of any property of the number: the Franciscan rule was confirmed in writing by Honorius III (Europe).
1223 is part of
Factors & digit properties
- Divisors (2)
- 1, 1223
- Prime factorisation
- 1223
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 1223
- Scientific notation
- 1.223 × 10^3
Roman numerals
M C C X X I I I
Binary
1 0 0 1 1 0 0 0 1 1 1
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,223
Octal
2 3 0 7
2 × 512 + 3 × 64 + 0 × 8 + 7 × 1 = 1,223
Hexadecimal
4 c 7
4 × 256 + c × 16 + 7 × 1 = 1,223
Read as powers of two: 1,024 + 128 + 64 + 4 + 2 + 1 = 1,223.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 2 hobbles, 3 strokes
1 × 1,000 + 2 × 100 + 2 × 10 + 3 × 1 = 1,223. 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), 2 corner wedges + 3 vertical wedges (units place)
20 × 60 + 23 = 1223. 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
- Sophie Germain prime
Related numbers & connections
1223 is a year in the 13th century, in the 1220s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1223, the Franciscan rule was confirmed in writing by Honorius III (Europe).
DocumentedHistoryGeography: EuropePeriod: 1223
Common questions
Is 1223 a prime number?
Yes, 1223 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 1223?
The factors of 1223 are 1, 1223.
What is 1223 in Roman numerals?
1223 in Roman numerals is MCCXXIII.
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