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Number

61,991

61,991 is a prime, odd.

Cousin Prime Deficient Number Prime Squarefree

Properties

Parity
Odd
Digit count
5
Digit sum
26
Digital root
8
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
61,992

Primality

61,991 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 61991
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 61,991)
1 × 61991
First multiples
61,991 · 123,982 · 185,973 · 247,964 · 309,955 · 371,946 · 433,937 · 495,928 · 557,919 · 619,910

Representations

In words
sixty-one thousand nine hundred ninety-one
Ordinal
61991st
Binary
1111001000100111
Octal
171047
Hexadecimal
F227

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 61,987 (gap of 4)
  • Next prime: 62,003 (gap of 12)

Pair status: cousin with 61987.

Hex color
#00F227
RGB(0, 242, 39)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.242.39.