number.wiki
Number

1,291

1,291 is a prime, odd, a calendar year.

Deficient Number Prime Sexy Prime Squarefree Twin Prime Year

Properties

Parity
Odd
Digit count
4
Digit sum
13
Digital root
4
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
1,292

Primality

1,291 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 1291
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 1,291)
1 × 1291
First multiples
1,291 · 2,582 · 3,873 · 5,164 · 6,455 · 7,746 · 9,037 · 10,328 · 11,619 · 12,910

Representations

In words
one thousand two hundred ninety-one
Ordinal
1291st
Roman numeral
MCCXCI
Binary
10100001011
Octal
2413
Hexadecimal
50B

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 1,289 (gap of 2)
  • Next prime: 1,297 (gap of 6)

Pair status: twin with 1289, sexy with 1297.

Unicode codepoint
ԋ
U+050B
Lowercase letter (Ll)

UTF-8 encoding: D4 8B (2 bytes).

Lookup U+050B on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#00050B
RGB(0, 5, 11)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.11.