819
819 is a composite number, odd, a calendar year.
Historical context — 819 AD
Calendar year
Year 819 (DCCCXIX) was a common year starting on Saturday of the Julian calendar.
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Historical context — 819 BC
Decade
This article concerns the period 819 BC – 810 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
-
Tuesday
January 1, 819
- Ended on
-
Tuesday
December 31, 819
- Friday the 13ths
-
2
2 Friday the 13ths this year.
- Decade
-
810s
810–819
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,207
1207 years before 2026.
In other calendars
- Hebrew
-
4579 / 4580 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
203 / 204 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Pig
Sexagenary cycle position 36 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1362 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
197 / 198 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
811 / 812 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
741 / 740 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 18
- Digit product
- 72
- Digital root
- 9
- Palindrome
- No
- Bit width
- 10 bits
- Reversed
- 918
- Flips to (rotate 180°)
- 618
- Recamán's sequence
- a(2,110) = 819
- Square (n²)
- 670,761
- Cube (n³)
- 549,353,259
- Divisor count
- 12
- σ(n) — sum of divisors
- 1,456
- φ(n) — Euler's totient
- 432
- Sum of prime factors
- 26
Primality
Prime factorization: 3 2 × 7 × 13
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred nineteen
- Ordinal
- 819th
- Roman numeral
- DCCCXIX
- Binary
- 1100110011
- Octal
- 1463
- Hexadecimal
- 0x333
- Base64
- AzM=
- One's complement
- 64,716 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ωιθʹ
- Mayan (base 20)
- 𝋢·𝋠·𝋳
- Chinese
- 八百一十九
- Chinese (financial)
- 捌佰壹拾玖
Digit at this position in famous constants
- π — Pi (π)
- Digit 819 = 0
- e — Euler's number (e)
- Digit 819 = 4
- φ — Golden ratio (φ)
- Digit 819 = 9
- √2 — Pythagoras's (√2)
- Digit 819 = 7
- ln 2 — Natural log of 2
- Digit 819 = 5
- γ — Euler-Mascheroni (γ)
- Digit 819 = 0
Also seen as
UTF-8 encoding: CC B3 (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.51.
- Address
- 0.0.3.51
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.51
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 819 is an active NANP area code (North American Numbering Plan).
- Primary area
- Western Québec
- Region
- Québec
- Country
- Canada
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.