256160221 has 2 divisors, whose sum is σ = 256160222. Its totient is φ = 256160220.

The previous prime is 256160209. The next prime is 256160227. The reversal of 256160221 is 122061652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256160025 + 196 = 16005^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 256160221 - 2²³ = 247771613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256160227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128080110 + 128080111.

It is an arithmetic number, because the mean of its divisors is an integer number (128080111).

Almost surely, 2^256160221 is an apocalyptic number.

It is an amenable number.

256160221 is a deficient number, since it is larger than the sum of its proper divisors (1).

256160221 is an equidigital number, since it uses as much as digits as its factorization.

256160221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 256160221 is about 16005.0061230854. The cubic root of 256160221 is about 635.0928592991.

The spelling of 256160221 in words is "two hundred fifty-six million, one hundred sixty thousand, two hundred twenty-one".