Number
61
61 is a prime, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 2
- Digit sum
- 7
- Digital root
- 7
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 62
Primality
61 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
Representations
- In words
- sixty-one
- Ordinal
- 61st
- Roman numeral
- LXI
- Binary
- 111101
- Octal
- 75
- Hexadecimal
- 3D
Also seen as
Prime neighborhood
ASCII character
As an ASCII codepoint, 61 is =. Printable ASCII character =.
Hex color
#00003D
RGB(0, 0, 61)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.61.