901
901 is a composite number, odd, a calendar year.
Historical context — 901 AD
Calendar year
Year 901 (CMI) was a common year starting on Thursday of the Julian calendar.
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Historical context — 901 BC
Decade
The 900s BC is a decade that lasted from 909 BC to 900 BC.
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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
- 52
- Started on
-
Saturday
January 1, 901
- Ended on
-
Saturday
December 31, 901
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
900s
900–909
- Century
-
10th century
901–1000
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,125
1125 years before 2026.
In other calendars
- Hebrew
-
4661 / 4662 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
288 / 289 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Rooster
Sexagenary cycle position 58 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1444 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
279 / 280 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
893 / 894 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
823 / 822 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 10
- Digit product
- 0
- Digital root
- 1
- Palindrome
- No
- Bit width
- 10 bits
- Reversed
- 109
- Flips to (rotate 180°)
- 106
- Recamán's sequence
- a(405) = 901
- Square (n²)
- 811,801
- Cube (n³)
- 731,432,701
- Divisor count
- 4
- σ(n) — sum of divisors
- 972
- φ(n) — Euler's totient
- 832
- Sum of prime factors
- 70
Primality
Prime factorization: 17 × 53
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- nine hundred one
- Ordinal
- 901st
- Roman numeral
- CMI
- Binary
- 1110000101
- Octal
- 1605
- Hexadecimal
- 0x385
- Base64
- A4U=
- One's complement
- 64,634 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹𒁹𒁹 𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺
- Greek (Milesian)
- ϡαʹ
- Mayan (base 20)
- 𝋢·𝋥·𝋡
- Chinese
- 九百零一
- Chinese (financial)
- 玖佰零壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 901 = 3
- e — Euler's number (e)
- Digit 901 = 6
- φ — Golden ratio (φ)
- Digit 901 = 4
- √2 — Pythagoras's (√2)
- Digit 901 = 2
- ln 2 — Natural log of 2
- Digit 901 = 1
- γ — Euler-Mascheroni (γ)
- Digit 901 = 6
Also seen as
UTF-8 encoding: CE 85 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.133.
- Address
- 0.0.3.133
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.133
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 901 is an active NANP area code (North American Numbering Plan).
- Primary area
- Memphis
- Region
- Tennessee
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.