256417201 has 2 divisors, whose sum is σ = 256417202. Its totient is φ = 256417200.

The previous prime is 256417193. The next prime is 256417211. The reversal of 256417201 is 102714652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248882176 + 7535025 = 15776^2 + 2745^2 .

It is a cyclic number.

It is not a de Polignac number, because 256417201 - 2³ = 256417193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256417201.

It is not a weakly prime, because it can be changed into another prime (256417211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128208600 + 128208601.

It is an arithmetic number, because the mean of its divisors is an integer number (128208601).

Almost surely, 2^256417201 is an apocalyptic number.

It is an amenable number.

256417201 is a deficient number, since it is larger than the sum of its proper divisors (1).

256417201 is an equidigital number, since it uses as much as digits as its factorization.

256417201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 256417201 is about 16013.0322237857. The cubic root of 256417201 is about 635.3051634274.

The spelling of 256417201 in words is "two hundred fifty-six million, four hundred seventeen thousand, two hundred one".