256441791 has 4 divisors (see below), whose sum is σ = 341922392. Its totient is φ = 170961192.

The previous prime is 256441781. The next prime is 256441799. The reversal of 256441791 is 197144652.

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

It is a de Polignac number, because none of the positive numbers 2^k-256441791 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 (256441799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42740296 + ... + 42740301.

It is an arithmetic number, because the mean of its divisors is an integer number (85480598).

Almost surely, 2^256441791 is an apocalyptic number.

256441791 is a deficient number, since it is larger than the sum of its proper divisors (85480601).

256441791 is an equidigital number, since it uses as much as digits as its factorization.

256441791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85480600.

The product of its digits is 60480, while the sum is 39.

The square root of 256441791 is about 16013.8000174849. The cubic root of 256441791 is about 635.3254710284.

The spelling of 256441791 in words is "two hundred fifty-six million, four hundred forty-one thousand, seven hundred ninety-one".