256585297 has 2 divisors, whose sum is σ = 256585298. Its totient is φ = 256585296.

The previous prime is 256585283. The next prime is 256585321. The reversal of 256585297 is 792585652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225270081 + 31315216 = 15009^2 + 5596^2 .

It is a cyclic number.

It is not a de Polignac number, because 256585297 - 2²⁷ = 122367569 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256585297.

It is not a weakly prime, because it can be changed into another prime (256585207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128292648 + 128292649.

It is an arithmetic number, because the mean of its divisors is an integer number (128292649).

Almost surely, 2^256585297 is an apocalyptic number.

It is an amenable number.

256585297 is a deficient number, since it is larger than the sum of its proper divisors (1).

256585297 is an equidigital number, since it uses as much as digits as its factorization.

256585297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512000, while the sum is 49.

The square root of 256585297 is about 16018.2800886987. The cubic root of 256585297 is about 635.4439592761.

The spelling of 256585297 in words is "two hundred fifty-six million, five hundred eighty-five thousand, two hundred ninety-seven".