number.wiki
Number

823

823 is a prime, odd, a calendar year.

Cousin Prime Deficient Number Prime Sexy Prime Squarefree Twin Prime Year

Properties

Parity
Odd
Digit count
3
Digit sum
13
Digital root
4
Palindrome
No
Divisor count
2
σ(n) — sum of divisors
824

Primality

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

Divisors & multiples

All divisors (2)
1 · 823
Aliquot sum (sum of proper divisors): 1
Factor pairs (a × b = 823)
1 × 823
First multiples
823 · 1,646 · 2,469 · 3,292 · 4,115 · 4,938 · 5,761 · 6,584 · 7,407 · 8,230

Representations

In words
eight hundred twenty-three
Ordinal
823rd
Roman numeral
DCCCXXIII
Binary
1100110111
Octal
1467
Hexadecimal
337

Also seen as

Prime neighborhood

Adjacent primes:

  • Previous prime: 821 (gap of 2)
  • Next prime: 827 (gap of 4)

Pair status: twin with 821, cousin with 827.

Unicode codepoint
̷
U+0337
Non-spacing mark (Mn)

UTF-8 encoding: CC B7 (2 bytes).

Hex color
#000337
RGB(0, 3, 55)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.55.