856323317 has 2 divisors, whose sum is σ = 856323318. Its totient is φ = 856323316.

The previous prime is 856323257. The next prime is 856323319. The reversal of 856323317 is 713323658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 461347441 + 394975876 = 21479^2 + 19874^2 .

It is a cyclic number.

It is not a de Polignac number, because 856323317 - 2²² = 852129013 is a prime.

Together with 856323319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856323319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428161658 + 428161659.

It is an arithmetic number, because the mean of its divisors is an integer number (428161659).

Almost surely, 2^856323317 is an apocalyptic number.

It is an amenable number.

856323317 is a deficient number, since it is larger than the sum of its proper divisors (1).

856323317 is an equidigital number, since it uses as much as digits as its factorization.

856323317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 38.

The square root of 856323317 is about 29263.0025287905. The cubic root of 856323317 is about 949.6114078292.

The spelling of 856323317 in words is "eight hundred fifty-six million, three hundred twenty-three thousand, three hundred seventeen".