256318791 has 16 divisors (see below), whose sum is σ = 355244160. Its totient is φ = 164193120.

The previous prime is 256318789. The next prime is 256318793. The reversal of 256318791 is 197813652.

It is an interprime number because it is at equal distance from previous prime (256318789) and next prime (256318793).

It is not a de Polignac number, because 256318791 - 2¹ = 256318789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256318793) 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, 11376 + ... + 25338.

It is an arithmetic number, because the mean of its divisors is an integer number (22202760).

Almost surely, 2^256318791 is an apocalyptic number.

256318791 is a deficient number, since it is larger than the sum of its proper divisors (98925369).

256318791 is a wasteful number, since it uses less digits than its factorization.

256318791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14206.

The product of its digits is 90720, while the sum is 42.

The square root of 256318791 is about 16009.9591192482. The cubic root of 256318791 is about 635.2238787335.

The spelling of 256318791 in words is "two hundred fifty-six million, three hundred eighteen thousand, seven hundred ninety-one".