255455521 has 4 divisors (see below), whose sum is σ = 255764500. Its totient is φ = 255146544.

The previous prime is 255455489. The next prime is 255455527. The reversal of 255455521 is 125554552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82901025 + 172554496 = 9105^2 + 13136^2 .

It is a cyclic number.

It is not a de Polignac number, because 255455521 - 2⁵ = 255455489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255455527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153246 + ... + 154903.

It is an arithmetic number, because the mean of its divisors is an integer number (63941125).

Almost surely, 2^255455521 is an apocalyptic number.

It is an amenable number.

255455521 is a deficient number, since it is larger than the sum of its proper divisors (308979).

255455521 is an equidigital number, since it uses as much as digits as its factorization.

255455521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308978.

The product of its digits is 50000, while the sum is 34.

The square root of 255455521 is about 15982.9759744548. The cubic root of 255455521 is about 634.5099416109.

The spelling of 255455521 in words is "two hundred fifty-five million, four hundred fifty-five thousand, five hundred twenty-one".