256019903 has 4 divisors (see below), whose sum is σ = 256070568. Its totient is φ = 255969240.

The previous prime is 256019879. The next prime is 256019947. The reversal of 256019903 is 309910652.

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 256019903 - 2¹⁶ = 255954367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256019503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16793 + ... + 28178.

It is an arithmetic number, because the mean of its divisors is an integer number (64017642).

Almost surely, 2^256019903 is an apocalyptic number.

256019903 is a deficient number, since it is larger than the sum of its proper divisors (50665).

256019903 is an equidigital number, since it uses as much as digits as its factorization.

256019903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50664.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 256019903 is about 16000.6219566616. The cubic root of 256019903 is about 634.9768755917.

The spelling of 256019903 in words is "two hundred fifty-six million, nineteen thousand, nine hundred three".