256417169 has 2 divisors, whose sum is σ = 256417170. Its totient is φ = 256417168.

The previous prime is 256417153. The next prime is 256417181. The reversal of 256417169 is 961714652.

256417169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255616144 + 801025 = 15988^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 256417169 - 2⁴ = 256417153 is a prime.

It is a super-2 number, since 2×256417169² = 131499529115949122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256417969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128208584 + 128208585.

It is an arithmetic number, because the mean of its divisors is an integer number (128208585).

Almost surely, 2^256417169 is an apocalyptic number.

It is an amenable number.

256417169 is a deficient number, since it is larger than the sum of its proper divisors (1).

256417169 is an equidigital number, since it uses as much as digits as its factorization.

256417169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 256417169 is about 16013.0312245995. The cubic root of 256417169 is about 635.3051369994.

The spelling of 256417169 in words is "two hundred fifty-six million, four hundred seventeen thousand, one hundred sixty-nine".