256601903 has 4 divisors (see below), whose sum is σ = 262860528. Its totient is φ = 250343280.

The previous prime is 256601879. The next prime is 256601963. The reversal of 256601903 is 309106652.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 256601903 - 2⁸ = 256601647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256601903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256601963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3129251 + ... + 3129332.

It is an arithmetic number, because the mean of its divisors is an integer number (65715132).

Almost surely, 2^256601903 is an apocalyptic number.

256601903 is a deficient number, since it is larger than the sum of its proper divisors (6258625).

256601903 is an equidigital number, since it uses as much as digits as its factorization.

256601903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6258624.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 256601903 is about 16018.7984255998. The cubic root of 256601903 is about 635.4576674593.

The spelling of 256601903 in words is "two hundred fifty-six million, six hundred one thousand, nine hundred three".