256386353 has 2 divisors, whose sum is σ = 256386354. Its totient is φ = 256386352.

The previous prime is 256386343. The next prime is 256386391. The reversal of 256386353 is 353683652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256384144 + 2209 = 16012^2 + 47^2 .

It is a cyclic number.

It is not a de Polignac number, because 256386353 - 2⁶ = 256386289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256386353.

It is not a weakly prime, because it can be changed into another prime (256386343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128193176 + 128193177.

It is an arithmetic number, because the mean of its divisors is an integer number (128193177).

Almost surely, 2^256386353 is an apocalyptic number.

It is an amenable number.

256386353 is a deficient number, since it is larger than the sum of its proper divisors (1).

256386353 is an equidigital number, since it uses as much as digits as its factorization.

256386353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 41.

The square root of 256386353 is about 16012.0689793668. The cubic root of 256386353 is about 635.2796858339.

The spelling of 256386353 in words is "two hundred fifty-six million, three hundred eighty-six thousand, three hundred fifty-three".