256597 has 4 divisors (see below), whose sum is σ = 279936. Its totient is φ = 233260.

The previous prime is 256589. The next prime is 256603. The reversal of 256597 is 795652.

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 256597 - 2³ = 256589 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 4.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11653 + ... + 11674.

It is an arithmetic number, because the mean of its divisors is an integer number (69984).

2²⁵⁶⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

256597 is a deficient number, since it is larger than the sum of its proper divisors (23339).

256597 is a wasteful number, since it uses less digits than its factorization.

256597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23338.

The product of its digits is 18900, while the sum is 34.

The square root of 256597 is about 506.5540445007. The cubic root of 256597 is about 63.5453620115.

It can be divided in two parts, 2565 and 97, that added together give a palindrome (2662).

The spelling of 256597 in words is "two hundred fifty-six thousand, five hundred ninety-seven".