Number
261
261 is a composite number, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 9
- Digital root
- 9
- Palindrome
- No
- Divisor count
- 6
- σ(n) — sum of divisors
- 390
Primality
Prime factorization: 3 2 × 29
Divisors & multiples
Aliquot sum (sum of proper divisors):
129
Representations
- In words
- two hundred sixty-one
- Ordinal
- 261st
- Roman numeral
- CCLXI
- Binary
- 100000101
- Octal
- 405
- Hexadecimal
- 105
Also seen as
Unicode codepoint
ą
U+0105
Lowercase letter (Ll)
UTF-8 encoding: C4 85 (2 bytes).
Hex color
#000105
RGB(0, 1, 5)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.5.