256161203 has 2 divisors, whose sum is σ = 256161204. Its totient is φ = 256161202.

The previous prime is 256161187. The next prime is 256161221. The reversal of 256161203 is 302161652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256161203 - 2⁴ = 256161187 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (256161223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128080601 + 128080602.

It is an arithmetic number, because the mean of its divisors is an integer number (128080602).

Almost surely, 2^256161203 is an apocalyptic number.

256161203 is a deficient number, since it is larger than the sum of its proper divisors (1).

256161203 is an equidigital number, since it uses as much as digits as its factorization.

256161203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 256161203 is about 16005.0368009574. The cubic root of 256161203 is about 635.0936708490.

The spelling of 256161203 in words is "two hundred fifty-six million, one hundred sixty-one thousand, two hundred three".