256432117 has 2 divisors, whose sum is σ = 256432118. Its totient is φ = 256432116.

The previous prime is 256432061. The next prime is 256432133. The reversal of 256432117 is 711234652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175324081 + 81108036 = 13241^2 + 9006^2 .

It is a cyclic number.

It is not a de Polignac number, because 256432117 - 2¹⁹ = 255907829 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256432147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128216058 + 128216059.

It is an arithmetic number, because the mean of its divisors is an integer number (128216059).

Almost surely, 2^256432117 is an apocalyptic number.

It is an amenable number.

256432117 is a deficient number, since it is larger than the sum of its proper divisors (1).

256432117 is an equidigital number, since it uses as much as digits as its factorization.

256432117 is an evil number, because the sum of its binary digits is even.

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

The square root of 256432117 is about 16013.4979626564. The cubic root of 256432117 is about 635.3174819302.

Adding to 256432117 its reverse (711234652), we get a palindrome (967666769).

The spelling of 256432117 in words is "two hundred fifty-six million, four hundred thirty-two thousand, one hundred seventeen".