256392291 has 8 divisors (see below), whose sum is σ = 342272080. Its totient is φ = 170720352.

The previous prime is 256392281. The next prime is 256392319. The reversal of 256392291 is 192293652.

256392291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 256392291 - 2⁵ = 256392259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256392221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49060 + ... + 54033.

It is an arithmetic number, because the mean of its divisors is an integer number (42784010).

Almost surely, 2^256392291 is an apocalyptic number.

256392291 is a deficient number, since it is larger than the sum of its proper divisors (85879789).

256392291 is a wasteful number, since it uses less digits than its factorization.

256392291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103925.

The product of its digits is 58320, while the sum is 39.

The square root of 256392291 is about 16012.2544009268. The cubic root of 256392291 is about 635.2845902312.

The spelling of 256392291 in words is "two hundred fifty-six million, three hundred ninety-two thousand, two hundred ninety-one".