856318193 has 2 divisors, whose sum is σ = 856318194. Its totient is φ = 856318192.

The previous prime is 856318189. The next prime is 856318241. The reversal of 856318193 is 391813658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 573506704 + 282811489 = 23948^2 + 16817^2 .

It is a cyclic number.

It is not a de Polignac number, because 856318193 - 2² = 856318189 is a prime.

It is not a weakly prime, because it can be changed into another prime (856318093) 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, 428159096 + 428159097.

It is an arithmetic number, because the mean of its divisors is an integer number (428159097).

Almost surely, 2^856318193 is an apocalyptic number.

It is an amenable number.

856318193 is a deficient number, since it is larger than the sum of its proper divisors (1).

856318193 is an equidigital number, since it uses as much as digits as its factorization.

856318193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 856318193 is about 29262.9149778350. The cubic root of 856318193 is about 949.6095137555.

The spelling of 856318193 in words is "eight hundred fifty-six million, three hundred eighteen thousand, one hundred ninety-three".