256635361 has 2 divisors, whose sum is σ = 256635362. Its totient is φ = 256635360.

The previous prime is 256635347. The next prime is 256635397. The reversal of 256635361 is 163536652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255520225 + 1115136 = 15985^2 + 1056^2 .

It is a cyclic number.

It is not a de Polignac number, because 256635361 - 2¹¹ = 256633313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256635361.

It is not a weakly prime, because it can be changed into another prime (256635331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128317680 + 128317681.

It is an arithmetic number, because the mean of its divisors is an integer number (128317681).

Almost surely, 2^256635361 is an apocalyptic number.

It is an amenable number.

256635361 is a deficient number, since it is larger than the sum of its proper divisors (1).

256635361 is an equidigital number, since it uses as much as digits as its factorization.

256635361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 37.

The square root of 256635361 is about 16019.8427270682. The cubic root of 256635361 is about 635.4852851015.

The spelling of 256635361 in words is "two hundred fifty-six million, six hundred thirty-five thousand, three hundred sixty-one".