256903 has 2 divisors, whose sum is σ = 256904. Its totient is φ = 256902.

The previous prime is 256901. The next prime is 256931. The reversal of 256903 is 309652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256903 - 2¹ = 256901 is a prime.

Together with 256901, it forms a pair of twin primes.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128451 + 128452.

It is an arithmetic number, because the mean of its divisors is an integer number (128452).

2²⁵⁶⁹⁰³ is an apocalyptic number.

256903 is a deficient number, since it is larger than the sum of its proper divisors (1).

256903 is an equidigital number, since it uses as much as digits as its factorization.

256903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 256903 is about 506.8559953281. The cubic root of 256903 is about 63.5706119252.

The spelling of 256903 in words is "two hundred fifty-six thousand, nine hundred three".