256445251 has 8 divisors (see below), whose sum is σ = 259728480. Its totient is φ = 253180032.

The previous prime is 256445243. The next prime is 256445279. The reversal of 256445251 is 152544652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256445251 - 2³ = 256445243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256445291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25405 + ... + 34033.

It is an arithmetic number, because the mean of its divisors is an integer number (32466060).

Almost surely, 2^256445251 is an apocalyptic number.

256445251 is a deficient number, since it is larger than the sum of its proper divisors (3283229).

256445251 is a wasteful number, since it uses less digits than its factorization.

256445251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9005.

The product of its digits is 48000, while the sum is 34.

The square root of 256445251 is about 16013.9080489430. The cubic root of 256445251 is about 635.3283283581.

The spelling of 256445251 in words is "two hundred fifty-six million, four hundred forty-five thousand, two hundred fifty-one".