256682513 has 2 divisors, whose sum is σ = 256682514. Its totient is φ = 256682512.

The previous prime is 256682501. The next prime is 256682521. The reversal of 256682513 is 315286652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197346304 + 59336209 = 14048^2 + 7703^2 .

It is a cyclic number.

It is not a de Polignac number, because 256682513 - 2²⁴ = 239905297 is a prime.

It is not a weakly prime, because it can be changed into another prime (256682213) 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, 128341256 + 128341257.

It is an arithmetic number, because the mean of its divisors is an integer number (128341257).

Almost surely, 2^256682513 is an apocalyptic number.

It is an amenable number.

256682513 is a deficient number, since it is larger than the sum of its proper divisors (1).

256682513 is an equidigital number, since it uses as much as digits as its factorization.

256682513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 38.

The square root of 256682513 is about 16021.3143343485. The cubic root of 256682513 is about 635.5242022731.

The spelling of 256682513 in words is "two hundred fifty-six million, six hundred eighty-two thousand, five hundred thirteen".