256173313 has 8 divisors (see below), whose sum is σ = 279925056. Its totient is φ = 232498800.

The previous prime is 256173299. The next prime is 256173331. The reversal of 256173313 is 313371652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256173313 - 2²⁵ = 222618881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256173353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12253 + ... + 25738.

It is an arithmetic number, because the mean of its divisors is an integer number (34990632).

Almost surely, 2^256173313 is an apocalyptic number.

It is an amenable number.

256173313 is a deficient number, since it is larger than the sum of its proper divisors (23751743).

256173313 is a wasteful number, since it uses less digits than its factorization.

256173313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38615.

The product of its digits is 11340, while the sum is 31.

The square root of 256173313 is about 16005.4151148916. The cubic root of 256173313 is about 635.1036786918.

The spelling of 256173313 in words is "two hundred fifty-six million, one hundred seventy-three thousand, three hundred thirteen".