1,215
1,215 is a composite number, odd, a calendar year.
Notable events — 1215 AD
- Jun 15 King John seals Magna Carta at Runnymede.
Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0
Year facts
- Year type
-
Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
- Days in year
- 365
- ISO weeks
-
53
Long year: contains 53 ISO weeks.
- Started on
-
Thursday
January 1, 1215
- Ended on
-
Thursday
December 31, 1215
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
1210s
1210–1219
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
811
811 years before 2026.
In other calendars
- Hebrew
-
4975 / 4976 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
611 / 612 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Wood zodiac:Pig
Sexagenary cycle position 12 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1758 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
593 / 594 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1207 / 1208 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1137 / 1136 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 9
- Digit product
- 10
- Digital root
- 9
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 5,121
- Recamán's sequence
- a(8,558) = 1,215
- Square (n²)
- 1,476,225
- Cube (n³)
- 1,793,613,375
- Divisor count
- 12
- σ(n) — sum of divisors
- 2,184
- φ(n) — Euler's totient
- 648
- Sum of prime factors
- 20
Primality
Prime factorization: 3 5 × 5
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred fifteen
- Ordinal
- 1215th
- Roman numeral
- MCCXV
- Binary
- 10010111111
- Octal
- 2277
- Hexadecimal
- 0x4BF
- Base64
- BL8=
- One's complement
- 64,320 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασιεʹ
- Mayan (base 20)
- 𝋣·𝋠·𝋯
- Chinese
- 一千二百一十五
- Chinese (financial)
- 壹仟貳佰壹拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,215 = 0
- e — Euler's number (e)
- Digit 1,215 = 8
- φ — Golden ratio (φ)
- Digit 1,215 = 4
- √2 — Pythagoras's (√2)
- Digit 1,215 = 1
- ln 2 — Natural log of 2
- Digit 1,215 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,215 = 4
Also seen as
UTF-8 encoding: D2 BF (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.191.
- Address
- 0.0.4.191
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.191
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1215 first appears in π at position 11,941 of the decimal expansion (the 11,941ordinal-suffix:st digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.