256127513 has 2 divisors, whose sum is σ = 256127514. Its totient is φ = 256127512.

The previous prime is 256127503. The next prime is 256127519. The reversal of 256127513 is 315721652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208282624 + 47844889 = 14432^2 + 6917^2 .

It is a cyclic number.

It is not a de Polignac number, because 256127513 - 2⁴ = 256127497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256127513.

It is not a weakly prime, because it can be changed into another prime (256127519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128063756 + 128063757.

It is an arithmetic number, because the mean of its divisors is an integer number (128063757).

Almost surely, 2^256127513 is an apocalyptic number.

It is an amenable number.

256127513 is a deficient number, since it is larger than the sum of its proper divisors (1).

256127513 is an equidigital number, since it uses as much as digits as its factorization.

256127513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 32.

The square root of 256127513 is about 16003.9842851710. The cubic root of 256127513 is about 635.0658273874.

The spelling of 256127513 in words is "two hundred fifty-six million, one hundred twenty-seven thousand, five hundred thirteen".