256143172 has 6 divisors (see below), whose sum is σ = 448250558. Its totient is φ = 128071584.

The previous prime is 256143169. The next prime is 256143179. The reversal of 256143172 is 271341652.

256143172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 237961476 + 18181696 = 15426^2 + 4264^2 .

It is not an unprimeable number, because it can be changed into a prime (256143179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32017893 + ... + 32017900.

Almost surely, 2^256143172 is an apocalyptic number.

It is an amenable number.

256143172 is a deficient number, since it is larger than the sum of its proper divisors (192107386).

256143172 is a wasteful number, since it uses less digits than its factorization.

256143172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64035797 (or 64035795 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 256143172 is about 16004.4734996188. The cubic root of 256143172 is about 635.0787692395.

The spelling of 256143172 in words is "two hundred fifty-six million, one hundred forty-three thousand, one hundred seventy-two".