256682317 has 4 divisors (see below), whose sum is σ = 258641856. Its totient is φ = 254722780.

The previous prime is 256682299. The next prime is 256682341. The reversal of 256682317 is 713286652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256682317 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256682317.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256682117) 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, 979573 + ... + 979834.

It is an arithmetic number, because the mean of its divisors is an integer number (64660464).

Almost surely, 2^256682317 is an apocalyptic number.

It is an amenable number.

256682317 is a deficient number, since it is larger than the sum of its proper divisors (1959539).

256682317 is a wasteful number, since it uses less digits than its factorization.

256682317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1959538.

The product of its digits is 120960, while the sum is 40.

The square root of 256682317 is about 16021.3082174958. The cubic root of 256682317 is about 635.5240405133.

The spelling of 256682317 in words is "two hundred fifty-six million, six hundred eighty-two thousand, three hundred seventeen".