256793791 has 4 divisors (see below), whose sum is σ = 256914784. Its totient is φ = 256672800.

The previous prime is 256793773. The next prime is 256793809. The reversal of 256793791 is 197397652.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (256793773) and next prime (256793809).

It is a cyclic number.

It is not a de Polignac number, because 256793791 - 2²⁷ = 122576063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256793731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57255 + ... + 61576.

It is an arithmetic number, because the mean of its divisors is an integer number (64228696).

Almost surely, 2^256793791 is an apocalyptic number.

256793791 is a deficient number, since it is larger than the sum of its proper divisors (120993).

256793791 is a wasteful number, since it uses less digits than its factorization.

256793791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120992.

The product of its digits is 714420, while the sum is 49.

The square root of 256793791 is about 16024.7867692522. The cubic root of 256793791 is about 635.6160273118.

The spelling of 256793791 in words is "two hundred fifty-six million, seven hundred ninety-three thousand, seven hundred ninety-one".