1,491
1,491 is a composite number, odd, a calendar year.
Historical context — 1491 AD
Calendar year
Year 1491 (MCDXCI) was a common year starting on Saturday 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, 1491
- Ended on
-
Thursday
December 31, 1491
- Friday the 13ths
-
3
3 Friday the 13ths this year.
- Decade
-
1490s
1490–1499
- Century
-
15th century
1401–1500
- Millennium
-
2nd millennium
1001–2000
- Years ago
-
535
535 years before 2026.
In other calendars
- Hebrew
-
5251 / 5252 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
896 / 897 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Pig
Sexagenary cycle position 48 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
2034 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
869 / 870 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
1483 / 1484 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
1413 / 1412 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 3 × 7 × 71
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- one thousand four hundred ninety-one
- Ordinal
- 1491st
- Roman numeral
- MCDXCI
- Binary
- 10111010011
- Octal
- 2723
- Hexadecimal
- 0x5D3
- Base64
- BdM=
- One's complement
- 64,044 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺
- Greek (Milesian)
- ͵αυϟαʹ
- Mayan (base 20)
- 𝋣·𝋮·𝋫
- Chinese
- 一千四百九十一
- Chinese (financial)
- 壹仟肆佰玖拾壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 1,491 = 9
- e — Euler's number (e)
- Digit 1,491 = 0
- φ — Golden ratio (φ)
- Digit 1,491 = 8
- √2 — Pythagoras's (√2)
- Digit 1,491 = 4
- ln 2 — Natural log of 2
- Digit 1,491 = 1
- γ — Euler-Mascheroni (γ)
- Digit 1,491 = 4
Also seen as
UTF-8 encoding: D7 93 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.211.
- Address
- 0.0.5.211
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.5.211
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 1491 first appears in π at position 13,189 of the decimal expansion (the 13,189ordinal-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.