256406051 has 8 divisors (see below), whose sum is σ = 279896304. Its totient is φ = 232945920.

The previous prime is 256406039. The next prime is 256406077. The reversal of 256406051 is 150604652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256406051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256406011) 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, 12635 + ... + 25931.

It is an arithmetic number, because the mean of its divisors is an integer number (34987038).

Almost surely, 2^256406051 is an apocalyptic number.

256406051 is a deficient number, since it is larger than the sum of its proper divisors (23490253).

256406051 is a wasteful number, since it uses less digits than its factorization.

256406051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15061.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 256406051 is about 16012.6840660771. The cubic root of 256406051 is about 635.2959547949.

The spelling of 256406051 in words is "two hundred fifty-six million, four hundred six thousand, fifty-one".