256522025 has 6 divisors (see below), whose sum is σ = 318087342. Its totient is φ = 205217600.

The previous prime is 256522001. The next prime is 256522033. The reversal of 256522025 is 520225652.

It can be written as a sum of positive squares in 3 ways, for example, as 71453209 + 185068816 = 8453^2 + 13604^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256522025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5130416 + ... + 5130465.

It is an arithmetic number, because the mean of its divisors is an integer number (53014557).

Almost surely, 2^256522025 is an apocalyptic number.

256522025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256522025 is a deficient number, since it is larger than the sum of its proper divisors (61565317).

256522025 is a wasteful number, since it uses less digits than its factorization.

256522025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10260891 (or 10260886 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 256522025 is about 16016.3049733701. The cubic root of 256522025 is about 635.3917230855.

Adding to 256522025 its reverse (520225652), we get a palindrome (776747677).

The spelling of 256522025 in words is "two hundred fifty-six million, five hundred twenty-two thousand, twenty-five".