256488559 has 2 divisors, whose sum is σ = 256488560. Its totient is φ = 256488558.

The previous prime is 256488527. The next prime is 256488569. The reversal of 256488559 is 955884652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256488559 - 2⁵ = 256488527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256488569) 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, 128244279 + 128244280.

It is an arithmetic number, because the mean of its divisors is an integer number (128244280).

Almost surely, 2^256488559 is an apocalyptic number.

256488559 is a deficient number, since it is larger than the sum of its proper divisors (1).

256488559 is an equidigital number, since it uses as much as digits as its factorization.

256488559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456000, while the sum is 52.

The square root of 256488559 is about 16015.2601914549. The cubic root of 256488559 is about 635.3640907029.

The spelling of 256488559 in words is "two hundred fifty-six million, four hundred eighty-eight thousand, five hundred fifty-nine".