Number

919

919 is a prime, odd, a calendar year.

Arithmetic Number Chen Prime Deficient Number Flippable Odious Number Palindrome Pernicious Number Prime Recamán's Sequence Squarefree Year

Historical context — 919 AD

Calendar year

Year 919 (CMXIX) was a common year starting on Friday of the Julian calendar.

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Historical context — 919 BC

Decade

The 910s BC is a decade that lasted from 919 BC to 910 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: Sunday
January 1, 919
Ended on: Sunday
December 31, 919
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 910s
910–919
Century: 10th century
901–1000
Millennium: 1st millennium
1–1000
Years ago: 1,107
1107 years before 2026.

In other calendars

Hebrew: 4679 / 4680 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 306 / 307 AH
Lunar calendar; year spans differ from Gregorian.
Chinese: Year of the zodiac:Earth zodiac:Rabbit
Sexagenary cycle position 16 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 1462 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 297 / 298 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 911 / 912 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 841 / 840 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 3
Digit sum: 19
Digit product: 81
Digital root: 1
Palindrome: Yes
Bit width: 10 bits
Flips to (rotate 180°): 616
Recamán's sequence: a(589) = 919
Square (n²): 844,561
Cube (n³): 776,151,559
Divisor count: 2
σ(n) — sum of divisors: 920
φ(n) — Euler's totient: 918

Primality

919 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 919

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 919)

1 × 919

First multiples

919 · 1,838 (double) · 2,757 · 3,676 · 4,595 · 5,514 · 6,433 · 7,352 · 8,271 · 9,190

Sums & aliquot sequence

As consecutive integers: 459 + 460

Representations

In words: nine hundred nineteen
Ordinal: 919th
Roman numeral: CMXIX
Binary: 1110010111
Octal: 1627
Hexadecimal: 0x397
Base64: A5c=
One's complement: 64,616 (16-bit)

In other bases

ternary (3) 1021001

quaternary (4) 32113

quinary (5) 12134

senary (6) 4131

septenary (7) 2452

nonary (9) 1231

undecimal (11) 766

duodecimal (12) 647

tridecimal (13) 559

tetradecimal (14) 499

pentadecimal (15) 414

Historical numeral systems

Babylonian (base 60): 𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ϡιθʹ
Mayan (base 20): 𝋢·𝋥·𝋳
Chinese: 九百一十九
Chinese (financial): 玖佰壹拾玖

In other modern scripts

Eastern Arabic ٩١٩ Devanagari ९१९ Bengali ৯১৯ Tamil ௯௧௯ Thai ๙๑๙ Tibetan ༩༡༩ Khmer ៩១៩ Lao ໙໑໙ Burmese ၉၁၉

Digit at this position in famous constants

π — Pi (π): Digit 919 = 8
e — Euler's number (e): Digit 919 = 2
φ — Golden ratio (φ): Digit 919 = 7
√2 — Pythagoras's (√2): Digit 919 = 7
ln 2 — Natural log of 2: Digit 919 = 4
γ — Euler-Mascheroni (γ): Digit 919 = 1

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 911 (gap of 8)
Next prime: 929 (gap of 10)

Unicode codepoint

Greek Capital Letter Eta

U+0397

Uppercase letter (Lu)

UTF-8 encoding: CE 97 (2 bytes).

Lookup U+0397 on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#000397

RGB(0, 3, 151)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.151.

Address: 0.0.3.151
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.3.151

Unspecified address (0.0.0.0/8) — "this network" placeholder.

NANP area code 919

The number 919 is an active NANP area code (North American Numbering Plan).

Primary area: Raleigh / Durham
Region: North Carolina
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.

Look up area code 919 ↗