256225621 has 16 divisors (see below), whose sum is σ = 274959360. Its totient is φ = 238051440.

The previous prime is 256225609. The next prime is 256225661. The reversal of 256225621 is 126522652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 256225621 - 2⁷ = 256225493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256225601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 548430 + ... + 548896.

It is an arithmetic number, because the mean of its divisors is an integer number (17184960).

Almost surely, 2^256225621 is an apocalyptic number.

It is an amenable number.

256225621 is a deficient number, since it is larger than the sum of its proper divisors (18733739).

256225621 is a wasteful number, since it uses less digits than its factorization.

256225621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984.

The product of its digits is 14400, while the sum is 31.

The square root of 256225621 is about 16007.0491034419. The cubic root of 256225621 is about 635.1469029996.

The spelling of 256225621 in words is "two hundred fifty-six million, two hundred twenty-five thousand, six hundred twenty-one".