256511894 has 16 divisors (see below), whose sum is σ = 410150400. Its totient is φ = 119966184.

The previous prime is 256511863. The next prime is 256511909. The reversal of 256511894 is 498115652.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39722 + ... + 45725.

It is an arithmetic number, because the mean of its divisors is an integer number (25634400).

Almost surely, 2^256511894 is an apocalyptic number.

256511894 is a deficient number, since it is larger than the sum of its proper divisors (153638506).

256511894 is a wasteful number, since it uses less digits than its factorization.

256511894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85547.

The product of its digits is 86400, while the sum is 41.

The square root of 256511894 is about 16015.9886987972. The cubic root of 256511894 is about 635.3833583219.

The spelling of 256511894 in words is "two hundred fifty-six million, five hundred eleven thousand, eight hundred ninety-four".