Number
542
542 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
- 816
Primality
Prime factorization: 2 × 271
Divisors & multiples
Aliquot sum (sum of proper divisors):
274
Representations
- In words
- five hundred forty-two
- Ordinal
- 542nd
- Roman numeral
- DXLII
- Binary
- 1000011110
- Octal
- 1036
- Hexadecimal
- 21E
Also seen as
Goldbach decomposition
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 542, here are decompositions:
- 19 + 523 = 542
- 43 + 499 = 542
- 79 + 463 = 542
- 103 + 439 = 542
- 109 + 433 = 542
- 163 + 379 = 542
- 193 + 349 = 542
- 211 + 331 = 542
Showing the first eight; more decompositions exist.
Unicode codepoint
Ȟ
U+021E
Uppercase letter (Lu)
UTF-8 encoding: C8 9E (2 bytes).
Hex color
#00021E
RGB(0, 2, 30)
IPv4 address
As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.30.