1,243
1,243 is a composite number, odd, a calendar year.
Historical context — 1243 AD
Calendar year
Year 1243 (MCCXLIII) was a common year starting on Thursday of the Julian calendar.
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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, 1243
- Ended on
-
Thursday
December 31, 1243
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
1240s
1240–1249
- Century
-
13th century
1201–1300
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
783
783 years before 2026.
In other calendars
- Hebrew
-
5003 / 5004 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
640 / 641 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Water zodiac:Rabbit
Sexagenary cycle position 40 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1786 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
621 / 622 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1235 / 1236 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1165 / 1164 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 11 × 113
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand two hundred forty-three
- Ordinal
- 1243rd
- Roman numeral
- MCCXLIII
- Binary
- 10011011011
- Octal
- 2333
- Hexadecimal
- 0x4DB
- Base64
- BNs=
- One's complement
- 64,292 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋 𒌋𒌋𒌋𒌋𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺
- Greek (Milesian)
- ͵ασμγʹ
- Mayan (base 20)
- 𝋣·𝋢·𝋣
- Chinese
- 一千二百四十三
- Chinese (financial)
- 壹仟貳佰肆拾參
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,243 = 6
- e — Euler's number (e)
- Digit 1,243 = 9
- φ — Golden ratio (φ)
- Digit 1,243 = 1
- √2 — Pythagoras's (√2)
- Digit 1,243 = 2
- ln 2 — Natural log of 2
- Digit 1,243 = 7
- γ — Euler-Mascheroni (γ)
- Digit 1,243 = 7
Also seen as
UTF-8 encoding: D3 9B (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.219.
- Address
- 0.0.4.219
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.219
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1243 first appears in π at position 2,295 of the decimal expansion (the 2,295ordinal-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.