256391337 has 8 divisors (see below), whose sum is σ = 342420736. Its totient is φ = 170644752.

The previous prime is 256391329. The next prime is 256391341. The reversal of 256391337 is 733193652.

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

It is not a de Polignac number, because 256391337 - 2³ = 256391329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256391295 and 256391304.

It is not an unprimeable number, because it can be changed into a prime (256391137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68578 + ... + 72219.

It is an arithmetic number, because the mean of its divisors is an integer number (42802592).

Almost surely, 2^256391337 is an apocalyptic number.

It is an amenable number.

256391337 is a deficient number, since it is larger than the sum of its proper divisors (86029399).

256391337 is a wasteful number, since it uses less digits than its factorization.

256391337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141407.

The product of its digits is 102060, while the sum is 39.

The square root of 256391337 is about 16012.2246112150. The cubic root of 256391337 is about 635.2838022951.

The spelling of 256391337 in words is "two hundred fifty-six million, three hundred ninety-one thousand, three hundred thirty-seven".