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Number

87,721

87,721 is a prime, odd.

Deficient Number Happy Number Prime Squarefree Twin Prime

Properties

Parity
Odd
Digit count
5
Digit sum
25
Digital root
7
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
87,722

Primality

87,721 is prime. It has exactly two divisors: 1 and itself.

Divisors & multiples

All divisors (2)
1 · 87721
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 87,721)
1 × 87721
First multiples
87,721 · 175,442 · 263,163 · 350,884 · 438,605 · 526,326 · 614,047 · 701,768 · 789,489 · 877,210

Representations

In words
eighty-seven thousand seven hundred twenty-one
Ordinal
87721st
Binary
10101011010101001
Octal
253251
Hexadecimal
156A9

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 87,719 (gap of 2)
  • Next prime: 87,739 (gap of 18)

Pair status: twin with 87719.

Hex color
#0156A9
RGB(1, 86, 169)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.1.86.169.