1,216
1,216 is a composite number, even, a calendar year.
Historical context — 1216 AD
Calendar year
Year 1216 (MCCXVI) was a leap year starting on Friday of the Julian calendar.
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Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
- 52
- Started on
-
Friday
January 1, 1216
- Ended on
-
Saturday
December 31, 1216
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1210s
1210–1219
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
810
810 years before 2026.
In other calendars
- Hebrew
-
4976 / 4977 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
612 / 613 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Fire zodiac:Rat
Sexagenary cycle position 13 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1759 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
594 / 595 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1208 / 1209 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1138 / 1137 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 6 × 19
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred sixteen
- Ordinal
- 1216th
- Roman numeral
- MCCXVI
- Binary
- 10011000000
- Octal
- 2300
- Hexadecimal
- 0x4C0
- Base64
- BMA=
- One's complement
- 64,319 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασιϛʹ
- Mayan (base 20)
- 𝋣·𝋠·𝋰
- Chinese
- 一千二百一十六
- Chinese (financial)
- 壹仟貳佰壹拾陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,216 = 7
- e — Euler's number (e)
- Digit 1,216 = 0
- φ — Golden ratio (φ)
- Digit 1,216 = 0
- √2 — Pythagoras's (√2)
- Digit 1,216 = 5
- ln 2 — Natural log of 2
- Digit 1,216 = 4
- γ — Euler-Mascheroni (γ)
- Digit 1,216 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1216, here are decompositions:
- 3 + 1213 = 1216
- 23 + 1193 = 1216
- 29 + 1187 = 1216
- 53 + 1163 = 1216
- 107 + 1109 = 1216
- 113 + 1103 = 1216
- 167 + 1049 = 1216
- 197 + 1019 = 1216
Showing the first eight; more decompositions exist.
UTF-8 encoding: D3 80 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.192.
- Address
- 0.0.4.192
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.192
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.
The digit sequence 1216 first appears in π at position 6,985 of the decimal expansion (the 6,985ordinal-suffix:th 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.