856369117 has 2 divisors, whose sum is σ = 856369118. Its totient is φ = 856369116.

The previous prime is 856369109. The next prime is 856369201. The reversal of 856369117 is 711963658.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 851414041 + 4955076 = 29179^2 + 2226^2 .

It is a cyclic number.

It is not a de Polignac number, because 856369117 - 2³ = 856369109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856369417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428184558 + 428184559.

It is an arithmetic number, because the mean of its divisors is an integer number (428184559).

Almost surely, 2^856369117 is an apocalyptic number.

It is an amenable number.

856369117 is a deficient number, since it is larger than the sum of its proper divisors (1).

856369117 is an equidigital number, since it uses as much as digits as its factorization.

856369117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 856369117 is about 29263.7850764388. The cubic root of 856369117 is about 949.6283373488.

The spelling of 856369117 in words is "eight hundred fifty-six million, three hundred sixty-nine thousand, one hundred seventeen".