256697 has 4 divisors (see below), whose sum is σ = 293376. Its totient is φ = 220020.

The previous prime is 256687. The next prime is 256699. The reversal of 256697 is 796652.

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 not a de Polignac number, because 256697 - 2⁸ = 256441 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256697.

It is not an unprimeable number, because it can be changed into a prime (256699) 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, 18329 + ... + 18342.

It is an arithmetic number, because the mean of its divisors is an integer number (73344).

2²⁵⁶⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

256697 is a deficient number, since it is larger than the sum of its proper divisors (36679).

256697 is an equidigital number, since it uses as much as digits as its factorization.

256697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36678.

The product of its digits is 22680, while the sum is 35.

The square root of 256697 is about 506.6527410367. The cubic root of 256697 is about 63.5536158244.

The spelling of 256697 in words is "two hundred fifty-six thousand, six hundred ninety-seven".