555 (number)
| ||||
|---|---|---|---|---|
| Cardinal | five hundred fifty-five | |||
| Ordinal | 555th (five hundred fifty-fifth) | |||
| Factorization | 3 × 5 × 37 | |||
| Divisors | 1, 3, 5, 15, 37, 111, 185, 555 | |||
| Greek numeral | ΦΝΕ´ | |||
| Roman numeral | DLV | |||
| Binary | 10001010112 | |||
| Ternary | 2021203 | |||
| Quaternary | 202234 | |||
| Quinary | 42105 | |||
| Senary | 23236 | |||
| Octal | 10538 | |||
| Duodecimal | 3A312 | |||
| Hexadecimal | 22B16 | |||
| Vigesimal | 17F20 | |||
| Base 36 | FF36 | |||
555 (five hundred [and] fifty-five) is the natural number following 554 and preceding 556.
In mathematics
555 is a sphenic number, with prime factorization 3 × 5 × 37.[1] It is a repdigit in base 10 and base 36. It is palindromic in bases 9 (6769), 10 (55510), and 12 (3A312). Because it is divisible by the sum of its digits (15), it is a Harshad number. It is also a Harshad number in binary, base 11, base 13 and hexadecimal.
555 is also a Moran number, because 555 ÷ (5+5+5) = 555 ÷ 15 = 37, and 37 is prime.[1]
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: .[2]
References
- ↑ 1.0 1.1 "Properties of number 555". www.numbersaplenty.com. Archived from the original on 2024-12-06. Retrieved 2025-04-03.
It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 37 = 555 / (5 + 5 + 5).
- ↑ 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
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