256088257 has 2 divisors, whose sum is σ = 256088258. Its totient is φ = 256088256.

The previous prime is 256088243. The next prime is 256088281. The reversal of 256088257 is 752880652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147282496 + 108805761 = 12136^2 + 10431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256088257 is a prime.

It is not a weakly prime, because it can be changed into another prime (256088207) 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, 128044128 + 128044129.

It is an arithmetic number, because the mean of its divisors is an integer number (128044129).

Almost surely, 2^256088257 is an apocalyptic number.

It is an amenable number.

256088257 is a deficient number, since it is larger than the sum of its proper divisors (1).

256088257 is an equidigital number, since it uses as much as digits as its factorization.

256088257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 268800, while the sum is 43.

The square root of 256088257 is about 16002.7577935805. The cubic root of 256088257 is about 635.0333807653.

The spelling of 256088257 in words is "two hundred fifty-six million, eighty-eight thousand, two hundred fifty-seven".