Number
381
381 is a composite number, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 12
- Digital root
- 3
- Palindrome
- No
- Divisor count
- 4
- σ(n) — sum of divisors
- 512
Primality
Prime factorization: 3 × 127
Divisors & multiples
Aliquot sum (sum of proper divisors):
131
Representations
- In words
- three hundred eighty-one
- Ordinal
- 381st
- Roman numeral
- CCCLXXXI
- Binary
- 101111101
- Octal
- 575
- Hexadecimal
- 17D
Also seen as
Unicode codepoint
Ž
U+017D
Uppercase letter (Lu)
UTF-8 encoding: C5 BD (2 bytes).
Hex color
#00017D
RGB(0, 1, 125)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.125.