256171523 has 2 divisors, whose sum is σ = 256171524. Its totient is φ = 256171522.

The previous prime is 256171519. The next prime is 256171549. The reversal of 256171523 is 325171652.

256171523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256171523 - 2² = 256171519 is a prime.

It is a super-2 number, since 2×256171523² = 131247698392279058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 256171523.

It is not a weakly prime, because it can be changed into another prime (256176523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128085761 + 128085762.

It is an arithmetic number, because the mean of its divisors is an integer number (128085762).

Almost surely, 2^256171523 is an apocalyptic number.

256171523 is a deficient number, since it is larger than the sum of its proper divisors (1).

256171523 is an equidigital number, since it uses as much as digits as its factorization.

256171523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 32.

The square root of 256171523 is about 16005.3591962192. The cubic root of 256171523 is about 635.1021994352.

The spelling of 256171523 in words is "two hundred fifty-six million, one hundred seventy-one thousand, five hundred twenty-three".