256897 has 4 divisors (see below), whose sum is σ = 265216. Its totient is φ = 248580.

The previous prime is 256889. The next prime is 256901. The reversal of 256897 is 798652.

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 256897 - 2³ = 256889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256877) 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, 4113 + ... + 4174.

It is an arithmetic number, because the mean of its divisors is an integer number (66304).

2²⁵⁶⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

256897 is a deficient number, since it is larger than the sum of its proper divisors (8319).

256897 is an equidigital number, since it uses as much as digits as its factorization.

256897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8318.

The product of its digits is 30240, while the sum is 37.

The square root of 256897 is about 506.8500764526. The cubic root of 256897 is about 63.5701170217.

The spelling of 256897 in words is "two hundred fifty-six thousand, eight hundred ninety-seven".