1215
1215 is the year King John sealed Magna Carta at Runnymede.
- Odd
- Composite
Where 1215 fits
Why 1215 is special
1215 is invoked far more often than it is read. Magna Carta was a peace treaty between a king and rebellious barons, annulled by the Pope within ten weeks, and most of its clauses concerned feudal dues. Three remain on the English statute book, including the one guaranteeing lawful judgment before imprisonment.
Same number, different meanings
How 1215 is understood across different contexts — never implying one meaning because of another.
- Mathematics
1215 is invoked far more often than it is read. Magna Carta was a peace treaty between a king and rebellious barons, annulled by the Pope within ten weeks, and most of its clauses concerned feudal dues. Three remain on the English statute book, including the one guaranteeing lawful judgment before imprisonment.
- History
In 1215, Magna Carta was sealed at Runnymede, and three of its clauses remain on the statute book (England).
- Law & regulation
Magna Carta was annulled by Pope Innocent III within ten weeks and most of its 63 clauses dealt with feudal grievances now meaningless. Three remain law in England, including the guarantee of lawful judgment before imprisonment — which is the clause everything else invoked about it rests on.
1215 is part of
Factors & digit properties
- Divisors (12)
- 1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215
- Prime factorisation
- 3^5 × 5
- Digit sum
- 9
- Digital root
- 9
Representations
- Decimal
- 1215
- Scientific notation
- 1.215 × 10^3
Roman numerals
M C C X V
Binary
1 0 0 1 0 1 1 1 1 1 1
1 × 1,024 + 0 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 1,215
Octal
2 2 7 7
2 × 512 + 2 × 64 + 7 × 8 + 7 × 1 = 1,215
Hexadecimal
4 b f
4 × 256 + b × 16 + f × 1 = 1,215
Read as powers of two: 1,024 + 128 + 32 + 16 + 8 + 4 + 2 + 1 = 1,215.
In historical numeral systems
Egyptian
1 lotus, 2 coils of rope, 1 hobble, 5 strokes
1 × 1,000 + 2 × 100 + 1 × 10 + 5 × 1 = 1,215. 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), 1 corner wedge + 5 vertical wedges (units place)
20 × 60 + 15 = 1215. 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
Related numbers & connections
1215 is a year in the 13th century, in the 1210s.
Becket was murdered in 1170 and Magna Carta sealed in 1215. Both are episodes in the same argument about whether a king is subject to any authority.
View 1170 →History
In 1215, Magna Carta was sealed at Runnymede, and three of its clauses remain on the statute book (England).
DocumentedHistoryGeography: EnglandPeriod: 1215In 1215, the Fourth Lateran Council defined transubstantiation and required annual confession (Europe).
DocumentedHistoryGeography: EuropePeriod: 1215
Law & regulation
Magna Carta was annulled by Pope Innocent III within ten weeks and most of its 63 clauses dealt with feudal grievances now meaningless. Three remain law in England, including the guarantee of lawful judgment before imprisonment — which is the clause everything else invoked about it rests on.
DocumentedLaw & regulationGeography: England
Common questions
Is 1215 a prime number?
No, 1215 is not prime.
What are the factors of 1215?
The factors of 1215 are 1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215.
What is 1215 in Roman numerals?
1215 in Roman numerals is MCCXV.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 3 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026