256504603 has 2 divisors, whose sum is σ = 256504604. Its totient is φ = 256504602.

The previous prime is 256504601. The next prime is 256504613. The reversal of 256504603 is 306405652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256504603 - 2¹ = 256504601 is a prime.

It is a super-2 number, since 2×256504603² = 131589222720375218, which contains 22 as substring.

Together with 256504601, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (256504601) 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 as a sum of consecutive naturals, namely, 128252301 + 128252302.

It is an arithmetic number, because the mean of its divisors is an integer number (128252302).

Almost surely, 2^256504603 is an apocalyptic number.

256504603 is a deficient number, since it is larger than the sum of its proper divisors (1).

256504603 is an equidigital number, since it uses as much as digits as its factorization.

256504603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 256504603 is about 16015.7610808853. The cubic root of 256504603 is about 635.3773382970.

The spelling of 256504603 in words is "two hundred fifty-six million, five hundred four thousand, six hundred three".