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Number

55,721

55,721 is a prime, odd.

Cousin Prime Deficient Number Prime Squarefree

Properties

Parity
Odd
Digit count
5
Digit sum
20
Digital root
2
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
55,722

Primality

55,721 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 55721
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 55,721)
1 × 55721
First multiples
55,721 · 111,442 · 167,163 · 222,884 · 278,605 · 334,326 · 390,047 · 445,768 · 501,489 · 557,210

Representations

In words
fifty-five thousand seven hundred twenty-one
Ordinal
55721st
Binary
1101100110101001
Octal
154651
Hexadecimal
D9A9

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 55,717 (gap of 4)
  • Next prime: 55,733 (gap of 12)

Pair status: cousin with 55717.

Hex color
#00D9A9
RGB(0, 217, 169)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.217.169.