555 (number)

Short description: Natural number

← 554 555 556 →
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:

[math]\displaystyle{ 113 + 131 + 311 = 555 }[/math].

It is the twenty-sixth number such that its Euler totient (288) is equal to the totient value of its sum-of-divisors: [math]\displaystyle{ \varphi(555) = \varphi(\sigma(555)) }[/math].