256312117 has 2 divisors, whose sum is σ = 256312118. Its totient is φ = 256312116.

The previous prime is 256312097. The next prime is 256312141. The reversal of 256312117 is 711213652.

It is a happy number.

256312117 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 can be written as a sum of positive squares in only one way, i.e., 248661361 + 7650756 = 15769^2 + 2766^2 .

It is a cyclic number.

It is not a de Polignac number, because 256312117 - 2²⁷ = 122094389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256312157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128156058 + 128156059.

It is an arithmetic number, because the mean of its divisors is an integer number (128156059).

Almost surely, 2^256312117 is an apocalyptic number.

It is an amenable number.

256312117 is a deficient number, since it is larger than the sum of its proper divisors (1).

256312117 is an equidigital number, since it uses as much as digits as its factorization.

256312117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 256312117 is about 16009.7506851294. The cubic root of 256312117 is about 635.2183653896.

Adding to 256312117 its reverse (711213652), we get a palindrome (967525769).

The spelling of 256312117 in words is "two hundred fifty-six million, three hundred twelve thousand, one hundred seventeen".