256927791 has 16 divisors (see below), whose sum is σ = 360200160. Its totient is φ = 162664320.

The previous prime is 256927787. The next prime is 256927813. The reversal of 256927791 is 197729652.

256927791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256927791 - 2² = 256927787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256927791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256927691) 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, 18900 + ... + 29513.

It is an arithmetic number, because the mean of its divisors is an integer number (22512510).

Almost surely, 2^256927791 is an apocalyptic number.

256927791 is a deficient number, since it is larger than the sum of its proper divisors (103272369).

256927791 is a wasteful number, since it uses less digits than its factorization.

256927791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48506.

The product of its digits is 476280, while the sum is 48.

The square root of 256927791 is about 16028.9672468316. The cubic root of 256927791 is about 635.7265670264.

The spelling of 256927791 in words is "two hundred fifty-six million, nine hundred twenty-seven thousand, seven hundred ninety-one".