256319171 has 2 divisors, whose sum is σ = 256319172. Its totient is φ = 256319170.

The previous prime is 256319131. The next prime is 256319233. The reversal of 256319171 is 171913652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256319171 - 2¹⁰ = 256318147 is a prime.

It is not a weakly prime, because it can be changed into another prime (256319111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128159585 + 128159586.

It is an arithmetic number, because the mean of its divisors is an integer number (128159586).

Almost surely, 2^256319171 is an apocalyptic number.

256319171 is a deficient number, since it is larger than the sum of its proper divisors (1).

256319171 is an equidigital number, since it uses as much as digits as its factorization.

256319171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 35.

The square root of 256319171 is about 16009.9709868569. The cubic root of 256319171 is about 635.2241926459.

The spelling of 256319171 in words is "two hundred fifty-six million, three hundred nineteen thousand, one hundred seventy-one".