Number
521
521 is a prime, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 3
- Digit sum
- 8
- Digital root
- 8
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 522
Primality
521 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
Representations
- In words
- five hundred twenty-one
- Ordinal
- 521st
- Roman numeral
- DXXI
- Binary
- 1000001001
- Octal
- 1011
- Hexadecimal
- 209
Also seen as
Prime neighborhood
Unicode codepoint
ȉ
U+0209
Lowercase letter (Ll)
UTF-8 encoding: C8 89 (2 bytes).
Hex color
#000209
RGB(0, 2, 9)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.9.
Possible US bank routing number
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Routing number
000000521
Federal Reserve
United States Government
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.