256872183 has 4 divisors (see below), whose sum is σ = 342496248. Its totient is φ = 171248120.

The previous prime is 256872173. The next prime is 256872223. The reversal of 256872183 is 381278652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256872183 - 2⁵ = 256872151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256872163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42812028 + ... + 42812033.

It is an arithmetic number, because the mean of its divisors is an integer number (85624062).

Almost surely, 2^256872183 is an apocalyptic number.

256872183 is a deficient number, since it is larger than the sum of its proper divisors (85624065).

256872183 is an equidigital number, since it uses as much as digits as its factorization.

256872183 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85624064.

The product of its digits is 161280, while the sum is 42.

The square root of 256872183 is about 16027.2325433931. The cubic root of 256872183 is about 635.6806993612.

The spelling of 256872183 in words is "two hundred fifty-six million, eight hundred seventy-two thousand, one hundred eighty-three".