256444169 has 2 divisors, whose sum is σ = 256444170. Its totient is φ = 256444168.

The previous prime is 256444117. The next prime is 256444213. The reversal of 256444169 is 961444652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256384144 + 60025 = 16012^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 256444169 - 2¹² = 256440073 is a prime.

It is a super-2 number, since 2×256444169² = 131527223628201122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256449169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128222084 + 128222085.

It is an arithmetic number, because the mean of its divisors is an integer number (128222085).

Almost surely, 2^256444169 is an apocalyptic number.

It is an amenable number.

256444169 is a deficient number, since it is larger than the sum of its proper divisors (1).

256444169 is an equidigital number, since it uses as much as digits as its factorization.

256444169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 41.

The square root of 256444169 is about 16013.8742657734. The cubic root of 256444169 is about 635.3274348259.

The spelling of 256444169 in words is "two hundred fifty-six million, four hundred forty-four thousand, one hundred sixty-nine".