Number

1,279

1,279 is a prime, odd, a calendar year.

Arithmetic Number Ascending Digits Cousin Prime Deficient Number Emirp Odious Number Prime Recamán's Sequence Squarefree Twin Prime Year

Notable events — 1279 AD

Mar 19 The Mongol Yuan dynasty defeats the last Song forces at Yamen, unifying China.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

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, 1279
Ended on: Sunday
December 31, 1279
Friday the 13ths: 2
2 Friday the 13ths this year.
Decade: 1270s
1270–1279
Century: 13th century
1201–1300
Millennium: 2nd millennium
1001–2000
Years ago: 747
747 years before 2026.

In other calendars

Hebrew: 5039 / 5040 AM
Rosh Hashanah falls in September/October.
Islamic Hijri: 677 / 678 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: 1822 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Persian Solar Hijri: 657 / 658 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
Ethiopian: 1271 / 1272 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): 1201 / 1200 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 4
Digit sum: 19
Digit product: 126
Digital root: 1
Palindrome: No
Bit width: 11 bits
Reversed: 9,721
Recamán's sequence: a(30,490) = 1,279
Square (n²): 1,635,841
Cube (n³): 2,092,240,639
Divisor count: 2
σ(n) — sum of divisors: 1,280
φ(n) — Euler's totient: 1,278

Primality

1,279 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)

1 · 1279

Aliquot sum (sum of proper divisors): 1

Factor pairs (a × b = 1,279)

1 × 1279

First multiples

1,279 · 2,558 (double) · 3,837 · 5,116 · 6,395 · 7,674 · 8,953 · 10,232 · 11,511 · 12,790

Sums & aliquot sequence

As consecutive integers: 639 + 640

Representations

In words: one thousand two hundred seventy-nine
Ordinal: 1279th
Roman numeral: MCCLXXIX
Binary: 10011111111
Octal: 2377
Hexadecimal: 0x4FF
Base64: BP8=
One's complement: 64,256 (16-bit)

In other bases

ternary (3) 1202101

quaternary (4) 103333

quinary (5) 20104

senary (6) 5531

septenary (7) 3505

nonary (9) 1671

undecimal (11) a63

duodecimal (12) 8a7

tridecimal (13) 775

tetradecimal (14) 675

pentadecimal (15) 5a4

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓆼𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): ͵ασοθʹ
Mayan (base 20): 𝋣·𝋣·𝋳
Chinese: 一千二百七十九
Chinese (financial): 壹仟貳佰柒拾玖

In other modern scripts

Eastern Arabic ١٢٧٩ Devanagari १२७९ Bengali ১২৭৯ Tamil ௧௨௭௯ Thai ๑๒๗๙ Tibetan ༡༢༧༩ Khmer ១២៧៩ Lao ໑໒໗໙ Burmese ၁၂၇၉

Digit at this position in famous constants

π — Pi (π): Digit 1,279 = 4
e — Euler's number (e): Digit 1,279 = 1
φ — Golden ratio (φ): Digit 1,279 = 6
√2 — Pythagoras's (√2): Digit 1,279 = 0
ln 2 — Natural log of 2: Digit 1,279 = 8
γ — Euler-Mascheroni (γ): Digit 1,279 = 4

Also seen as

Prime neighborhood

Adjacent primes:

Previous prime: 1,277 (gap of 2)
Next prime: 1,283 (gap of 4)

Pair status: twin with 1277, cousin with 1283.

Unicode codepoint

Cyrillic Small Letter Ha With Stroke

U+04FF

Lowercase letter (Ll)

UTF-8 encoding: D3 BF (2 bytes).

Lookup U+04FF on Compart ↗ Lookup on FileFormat.Info ↗

Hex color

#0004FF

RGB(0, 4, 255)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.4.255.

Address: 0.0.4.255
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.4.255

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

Position in π

The digit sequence 1279 first appears in π at position 11,307 of the decimal expansion (the 11,307ordinal-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.

Look up 1279 on Pi Search ↗