856317793 has 2 divisors, whose sum is σ = 856317794. Its totient is φ = 856317792.

The previous prime is 856317779. The next prime is 856317809. The reversal of 856317793 is 397713658.

856317793 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., 855972049 + 345744 = 29257^2 + 588^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856317793 is a prime.

It is not a weakly prime, because it can be changed into another prime (856317703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428158896 + 428158897.

It is an arithmetic number, because the mean of its divisors is an integer number (428158897).

Almost surely, 2^856317793 is an apocalyptic number.

It is an amenable number.

856317793 is a deficient number, since it is larger than the sum of its proper divisors (1).

856317793 is an equidigital number, since it uses as much as digits as its factorization.

856317793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 49.

The square root of 856317793 is about 29262.9081432451. The cubic root of 856317793 is about 949.6093658962.

The spelling of 856317793 in words is "eight hundred fifty-six million, three hundred seventeen thousand, seven hundred ninety-three".