256515097 has 2 divisors, whose sum is σ = 256515098. Its totient is φ = 256515096.

The previous prime is 256515089. The next prime is 256515151. The reversal of 256515097 is 790515652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 240746256 + 15768841 = 15516^2 + 3971^2 .

It is a cyclic number.

It is not a de Polignac number, because 256515097 - 2³ = 256515089 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256515197) 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, 128257548 + 128257549.

It is an arithmetic number, because the mean of its divisors is an integer number (128257549).

Almost surely, 2^256515097 is an apocalyptic number.

It is an amenable number.

256515097 is a deficient number, since it is larger than the sum of its proper divisors (1).

256515097 is an equidigital number, since it uses as much as digits as its factorization.

256515097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94500, while the sum is 40.

The square root of 256515097 is about 16016.0886923119. The cubic root of 256515097 is about 635.3860029353.

The spelling of 256515097 in words is "two hundred fifty-six million, five hundred fifteen thousand, ninety-seven".