Number
401
401 is a prime, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 5
- Digital root
- 5
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 402
Primality
401 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
Representations
- In words
- four hundred one
- Ordinal
- 401st
- Roman numeral
- CDI
- Binary
- 110010001
- Octal
- 621
- Hexadecimal
- 191
Also seen as
Prime neighborhood
Unicode codepoint
Ƒ
U+0191
Uppercase letter (Lu)
UTF-8 encoding: C6 91 (2 bytes).
HTTP status code
HTTP 401 Unauthorized — Authentication is required and has failed or not been provided.
4xx class: Client Error.
Hex color
#000191
RGB(0, 1, 145)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.1.145.