Number
1,621
1,621 is a prime, odd, a calendar year.
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 10
- Digital root
- 1
- Palindrome
- No
- Divisor count
- 2
- σ(n) — sum of divisors
- 1,622
Primality
1,621 is prime. It has exactly two divisors: 1 and itself.
Divisors & multiples
Aliquot sum (sum of proper divisors):
1
First multiples
Representations
- In words
- one thousand six hundred twenty-one
- Ordinal
- 1621st
- Roman numeral
- MDCXXI
- Binary
- 11001010101
- Octal
- 3125
- Hexadecimal
- 655
Also seen as
Prime neighborhood
Unicode codepoint
ٕ
U+0655
Non-spacing mark (Mn)
UTF-8 encoding: D9 95 (2 bytes).
Hex color
#000655
RGB(0, 6, 85)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.6.85.