256604587 has 2 divisors, whose sum is σ = 256604588. Its totient is φ = 256604586.

The previous prime is 256604507. The next prime is 256604591. The reversal of 256604587 is 785406652.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256604587 is a prime.

It is not a weakly prime, because it can be changed into another prime (256604507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128302293 + 128302294.

It is an arithmetic number, because the mean of its divisors is an integer number (128302294).

Almost surely, 2^256604587 is an apocalyptic number.

256604587 is a deficient number, since it is larger than the sum of its proper divisors (1).

256604587 is an equidigital number, since it uses as much as digits as its factorization.

256604587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 43.

The square root of 256604587 is about 16018.8822019515. The cubic root of 256604587 is about 635.4598830345.

The spelling of 256604587 in words is "two hundred fifty-six million, six hundred four thousand, five hundred eighty-seven".