256109201 has 2 divisors, whose sum is σ = 256109202. Its totient is φ = 256109200.

The previous prime is 256109177. The next prime is 256109207. The reversal of 256109201 is 102901652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207388801 + 48720400 = 14401^2 + 6980^2 .

It is a cyclic number.

It is not a de Polignac number, because 256109201 - 2¹⁸ = 255847057 is a prime.

It is not a weakly prime, because it can be changed into another prime (256109207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128054600 + 128054601.

It is an arithmetic number, because the mean of its divisors is an integer number (128054601).

Almost surely, 2^256109201 is an apocalyptic number.

It is an amenable number.

256109201 is a deficient number, since it is larger than the sum of its proper divisors (1).

256109201 is an equidigital number, since it uses as much as digits as its factorization.

256109201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 256109201 is about 16003.4121674098. The cubic root of 256109201 is about 635.0506922145.

The spelling of 256109201 in words is "two hundred fifty-six million, one hundred nine thousand, two hundred one".