256929791 has 8 divisors (see below), whose sum is σ = 263208960. Its totient is φ = 250722648.

The previous prime is 256929779. The next prime is 256929809. The reversal of 256929791 is 197929652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256929791 - 2¹⁸ = 256667647 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 (256929091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10751 + ... + 25088.

It is an arithmetic number, because the mean of its divisors is an integer number (32901120).

Almost surely, 2^256929791 is an apocalyptic number.

256929791 is a deficient number, since it is larger than the sum of its proper divisors (6279169).

256929791 is a wasteful number, since it uses less digits than its factorization.

256929791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36013.

The product of its digits is 612360, while the sum is 50.

The square root of 256929791 is about 16029.0296337614. The cubic root of 256929791 is about 635.7282165817.

The spelling of 256929791 in words is "two hundred fifty-six million, nine hundred twenty-nine thousand, seven hundred ninety-one".