256345087 has 2 divisors, whose sum is σ = 256345088. Its totient is φ = 256345086.

The previous prime is 256345081. The next prime is 256345099. The reversal of 256345087 is 780543652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256345087 - 2²⁷ = 122127359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256345081) 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 as a sum of consecutive naturals, namely, 128172543 + 128172544.

It is an arithmetic number, because the mean of its divisors is an integer number (128172544).

Almost surely, 2^256345087 is an apocalyptic number.

256345087 is a deficient number, since it is larger than the sum of its proper divisors (1).

256345087 is an equidigital number, since it uses as much as digits as its factorization.

256345087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 256345087 is about 16010.7803370104. The cubic root of 256345087 is about 635.2456007408.

The spelling of 256345087 in words is "two hundred fifty-six million, three hundred forty-five thousand, eighty-seven".