Number
643
643 is a prime, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 13
- Digital root
- 4
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 644
Primality
643 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
Representations
- In words
- six hundred forty-three
- Ordinal
- 643rd
- Roman numeral
- DCXLIII
- Binary
- 1010000011
- Octal
- 1203
- Hexadecimal
- 283
Also seen as
Prime neighborhood
Unicode codepoint
ʃ
U+0283
Lowercase letter (Ll)
UTF-8 encoding: CA 83 (2 bytes).
Hex color
#000283
RGB(0, 2, 131)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.131.