Number
1,521
1,521 is a composite number, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 9
- Digital root
- 9
- Palindrome
- No
- Divisor count
- 9
- σ(n) — sum of divisors
- 2,379
Primality
Prime factorization: 3 2 × 13 2
Divisors & multiples
Aliquot sum (sum of proper divisors):
858
First multiples
Representations
- In words
- one thousand five hundred twenty-one
- Ordinal
- 1521st
- Roman numeral
- MDXXI
- Binary
- 10111110001
- Octal
- 2761
- Hexadecimal
- 5F1
Also seen as
Unicode codepoint
ױ
U+05F1
Other letter (Lo)
UTF-8 encoding: D7 B1 (2 bytes).
Network port
TCP/UDP port 1521 is the registered port for Oracle DB — Oracle Database listener.
Hex color
#0005F1
RGB(0, 5, 241)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.5.241.