555 (number)
| ||||
|---|---|---|---|---|
| Cardinal | five hundred fifty-five | |||
| Ordinal | 555th (five hundred fifty-fifth) | |||
| Factorization | 3 × 5 × 37 | |||
| Greek numeral | ΦΝΕ´ | |||
| Roman numeral | DLV | |||
| Binary | 10001010112 | |||
| Ternary | 2021203 | |||
| Senary | 23236 | |||
| Octal | 10538 | |||
| Duodecimal | 3A312 | |||
| Hexadecimal | 22B16 | |||
555 (five hundred [and] fifty-five) is the natural number following 554 and preceding 556.
In mathematics
[edit]555 is a sphenic number. In base 10, it is a repdigit, and because it is divisible by the sum of its digits, it is a Harshad number. It is also a Harshad number in binary, base 11, base 13 and hexadecimal.
It is the sum of the first triplet of three-digit permutable primes in decimal:
- .
It is the twenty-sixth number such that its Euler totient (288) is equal to the totient value of its sum-of-divisors: .[1]
References
[edit]- ^ Sloane, N. J. A. (ed.). "Sequence A006872 (Numbers k such that phi(k) is phi(sigma(k)).)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2023-08-31.
External links
[edit]Media related to 555 (number) at Wikimedia Commons
