256682117 has 2 divisors, whose sum is σ = 256682118. Its totient is φ = 256682116.

The previous prime is 256682081. The next prime is 256682123. The reversal of 256682117 is 711286652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191379556 + 65302561 = 13834^2 + 8081^2 .

It is a cyclic number.

It is not a de Polignac number, because 256682117 - 2¹² = 256678021 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 (256682197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128341058 + 128341059.

It is an arithmetic number, because the mean of its divisors is an integer number (128341059).

Almost surely, 2^256682117 is an apocalyptic number.

It is an amenable number.

256682117 is a deficient number, since it is larger than the sum of its proper divisors (1).

256682117 is an equidigital number, since it uses as much as digits as its factorization.

256682117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 38.

The square root of 256682117 is about 16021.3019758071. The cubic root of 256682117 is about 635.5238754521.

The spelling of 256682117 in words is "two hundred fifty-six million, six hundred eighty-two thousand, one hundred seventeen".