1,090
1,090 is a composite number, even, a calendar year.
Historical context — 1090 AD
Calendar year
Year 1090 (MXC) was a common year starting on Tuesday of the Julian calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →
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
- 52
- Started on
-
Wednesday
January 1, 1090
- Ended on
-
Wednesday
December 31, 1090
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
1090s
1090–1099
- Century
-
11th century
1001–1100
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
936
936 years before 2026.
In other calendars
- Hebrew
-
4850 / 4851 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
482 / 483 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Horse
Sexagenary cycle position 7 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1633 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
468 / 469 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1082 / 1083 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1012 / 1011 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 10
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 11 bits
- Reversed
- 901
- Flips to (rotate 180°)
- 601
- Recamán's sequence
- a(288) = 1,090
- Square (n²)
- 1,188,100
- Cube (n³)
- 1,295,029,000
- Divisor count
- 8
- σ(n) — sum of divisors
- 1,980
- φ(n) — Euler's totient
- 432
- Sum of prime factors
- 116
Primality
Prime factorization: 2 × 5 × 109
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand ninety
- Ordinal
- 1090th
- Roman numeral
- MXC
- Binary
- 10001000010
- Octal
- 2102
- Hexadecimal
- 0x442
- Base64
- BEI=
- One's complement
- 64,445 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋
- Egyptian hieroglyphic
- 𓆼𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵αϟʹ
- Mayan (base 20)
- 𝋢·𝋮·𝋪
- Chinese
- 一千零九十
- Chinese (financial)
- 壹仟零玖拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,090 = 5
- e — Euler's number (e)
- Digit 1,090 = 7
- φ — Golden ratio (φ)
- Digit 1,090 = 3
- √2 — Pythagoras's (√2)
- Digit 1,090 = 5
- ln 2 — Natural log of 2
- Digit 1,090 = 6
- γ — Euler-Mascheroni (γ)
- Digit 1,090 = 1
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 1090, here are decompositions:
- 3 + 1087 = 1090
- 29 + 1061 = 1090
- 41 + 1049 = 1090
- 59 + 1031 = 1090
- 71 + 1019 = 1090
- 107 + 983 = 1090
- 113 + 977 = 1090
- 137 + 953 = 1090
Showing the first eight; more decompositions exist.
UTF-8 encoding: D1 82 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.66.
- Address
- 0.0.4.66
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.4.66
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1090 first appears in π at position 15,711 of the decimal expansion (the 15,711ordinal-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.