256963 has 4 divisors (see below), whose sum is σ = 293680. Its totient is φ = 220248.

The previous prime is 256957. The next prime is 256967. The reversal of 256963 is 369652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 256963 - 2⁵ = 256931 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256967) 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, 18348 + ... + 18361.

It is an arithmetic number, because the mean of its divisors is an integer number (73420).

2²⁵⁶⁹⁶³ is an apocalyptic number.

256963 is a deficient number, since it is larger than the sum of its proper divisors (36717).

256963 is an equidigital number, since it uses as much as digits as its factorization.

256963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36716.

The product of its digits is 9720, while the sum is 31.

The square root of 256963 is about 506.9151802817. The cubic root of 256963 is about 63.5755605372.

It can be divided in two parts, 2 and 56963, that added together give a palindrome (56965).

The spelling of 256963 in words is "two hundred fifty-six thousand, nine hundred sixty-three".