555 (number)

Short description: Natural number

| <- 554 | 555 | 556 ->

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List of numbers — Integers

← 0 100 200 300 400 500 600 700 800 900 →

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
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. 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:

113+131+311=555.

It is the twenty-sixth number such that its Euler totient (288) is equal to the totient value of its sum-of-divisors: φ(555)=φ(σ(555)).[1]

## References

1. ↑ Sloane, N. J. A., ed. "Sequence A006872 (Numbers k such that phi(k) is phi(sigma(k)).)". OEIS Foundation. https://oeis.org/A006872. Retrieved 2023-08-31.

## External links

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