Number
218
218 is a composite number, even, a calendar year.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 11
- Digital root
- 2
- Palindrome
- No
- Divisor count
- 4
- σ(n) — sum of divisors
- 330
Primality
Prime factorization: 2 × 109
Divisors & multiples
Aliquot sum (sum of proper divisors):
112
Representations
- In words
- two hundred eighteen
- Ordinal
- 218th
- Roman numeral
- CCXVIII
- Binary
- 11011010
- Octal
- 332
- Hexadecimal
- DA
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 218, here are decompositions:
- 7 + 211 = 218
- 19 + 199 = 218
- 37 + 181 = 218
- 61 + 157 = 218
- 67 + 151 = 218
- 79 + 139 = 218
- 109 + 109 = 218
Unicode codepoint
Ú
U+00DA
Uppercase letter (Lu)
UTF-8 encoding: C3 9A (2 bytes).
Hex color
#0000DA
RGB(0, 0, 218)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.218.