801
801 is a composite number, odd, a calendar year.
Historical context — 801 AD
Calendar year
Year 801 (DCCCI) was a common year starting on Friday of the Julian calendar, the 801st year of the Common Era (CE) and Anno Domini (AD) designations, the 801st year of the 1st millennium, the 1st year of the 9th century, and the 2nd year of the 800s decade.
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Historical context — 801 BC
Decade
This article concerns the period 809 BC – 800 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
-
Monday
January 1, 801
- Ended on
-
Monday
December 31, 801
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
800s
800–809
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,225
1225 years before 2026.
In other calendars
- Hebrew
-
4561 / 4562 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
184 / 185 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Metal zodiac:Snake
Sexagenary cycle position 18 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1344 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
179 / 180 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
793 / 794 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
723 / 722 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 9
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 10 bits
- Reversed
- 108
- Flips to (rotate 180°)
- 108
- Recamán's sequence
- a(289) = 801
- Square (n²)
- 641,601
- Cube (n³)
- 513,922,401
- Divisor count
- 6
- σ(n) — sum of divisors
- 1,170
- φ(n) — Euler's totient
- 528
- Sum of prime factors
- 95
Primality
Prime factorization: 3 2 × 89
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred one
- Ordinal
- 801st
- Roman numeral
- DCCCI
- Binary
- 1100100001
- Octal
- 1441
- Hexadecimal
- 0x321
- Base64
- AyE=
- One's complement
- 64,734 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹 𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺
- Greek (Milesian)
- ωαʹ
- Mayan (base 20)
- 𝋢·𝋠·𝋡
- Chinese
- 八百零一
- Chinese (financial)
- 捌佰零壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 801 = 9
- e — Euler's number (e)
- Digit 801 = 6
- φ — Golden ratio (φ)
- Digit 801 = 5
- √2 — Pythagoras's (√2)
- Digit 801 = 8
- ln 2 — Natural log of 2
- Digit 801 = 1
- γ — Euler-Mascheroni (γ)
- Digit 801 = 3
Also seen as
UTF-8 encoding: CC A1 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.33.
- Address
- 0.0.3.33
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.33
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 801 is an active NANP area code (North American Numbering Plan).
- Primary area
- Salt Lake City / Provo
- Region
- Utah
- 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.