256061587 has 2 divisors, whose sum is σ = 256061588. Its totient is φ = 256061586.

The previous prime is 256061573. The next prime is 256061621. The reversal of 256061587 is 785160652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256061587 - 2²⁷ = 121843859 is a prime.

It is a super-3 number, since 3×256061587³ (a number of 26 digits) contains 333 as substring.

It is equal to p_13992673 and since 256061587 and 13992673 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (256061527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128030793 + 128030794.

It is an arithmetic number, because the mean of its divisors is an integer number (128030794).

Almost surely, 2^256061587 is an apocalyptic number.

256061587 is a deficient number, since it is larger than the sum of its proper divisors (1).

256061587 is an equidigital number, since it uses as much as digits as its factorization.

256061587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 256061587 is about 16001.9244780120. The cubic root of 256061587 is about 635.0113350737.

The spelling of 256061587 in words is "two hundred fifty-six million, sixty-one thousand, five hundred eighty-seven".