1233
1233 is a year in the 13th century. Gregory IX assigned the pursuit of heresy to the Dominicans, formalising the Inquisition (Europe).
- Odd
- Composite
Where 1233 fits
Why 1233 is special
1233 has a profile because of what happened in it rather than because of any property of the number: Gregory IX assigned the pursuit of heresy to the Dominicans, formalising the Inquisition (Europe).
1233 is part of
Factors & digit properties
- Divisors (6)
- 1, 3, 9, 137, 411, 1233
- Prime factorisation
- 3^2 × 137
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 1233
- Scientific notation
- 1.233 × 10^3
Roman numerals
M C C X X X I I I
Binary
1 0 0 1 1 0 1 0 0 0 1
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 1 × 64 + 0 × 32 + 1 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 1 × 1 = 1,233
Octal
2 3 2 1
2 × 512 + 3 × 64 + 2 × 8 + 1 × 1 = 1,233
Hexadecimal
4 d 1
4 × 256 + d × 16 + 1 × 1 = 1,233
Read as powers of two: 1,024 + 128 + 64 + 16 + 1 = 1,233.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 3 hobbles, 3 strokes
1 × 1,000 + 2 × 100 + 3 × 10 + 3 × 1 = 1,233. 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), 3 corner wedges + 3 vertical wedges (units place)
20 × 60 + 33 = 1233. 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
- Happy number
- Harshad (Niven) number
- Lucky number (mathematical sieve)
Related numbers & connections
1233 is a year in the 13th century, in the 1230s.
Numbers Around Us
- appears inHistorical years
why?
Strength 0.50, confidence "high".
History
In 1233, Gregory IX assigned the pursuit of heresy to the Dominicans, formalising the Inquisition (Europe).
DocumentedHistoryGeography: EuropePeriod: 1233
Common questions
Is 1233 a prime number?
No, 1233 is not prime.
What are the factors of 1233?
The factors of 1233 are 1, 3, 9, 137, 411, 1233.
What is 1233 in Roman numerals?
1233 in Roman numerals is MCCXXXIII.
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