number.wiki
Number

18,311

18,311 is a prime, odd.

Cousin Prime Deficient Number Prime Squarefree Twin Prime

Properties

Parity
Odd
Digit count
5
Digit sum
14
Digital root
5
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
18,312

Primality

18,311 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 18311
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 18,311)
1 × 18311
First multiples
18,311 · 36,622 · 54,933 · 73,244 · 91,555 · 109,866 · 128,177 · 146,488 · 164,799 · 183,110

Representations

In words
eighteen thousand three hundred eleven
Ordinal
18311th
Binary
100011110000111
Octal
43607
Hexadecimal
4787

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 18,307 (gap of 4)
  • Next prime: 18,313 (gap of 2)

Pair status: twin with 18313, cousin with 18307.

Unicode codepoint
䞇
U+4787
Other letter (Lo)

UTF-8 encoding: E4 9E 87 (3 bytes).

Lookup U+4787 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#004787
RGB(0, 71, 135)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.71.135.