856674197 has 2 divisors, whose sum is σ = 856674198. Its totient is φ = 856674196.

The previous prime is 856674191. The next prime is 856674211. The reversal of 856674197 is 791476658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489338641 + 367335556 = 22121^2 + 19166^2 .

It is a cyclic number.

It is not a de Polignac number, because 856674197 - 2²⁶ = 789565333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856674191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428337098 + 428337099.

It is an arithmetic number, because the mean of its divisors is an integer number (428337099).

Almost surely, 2^856674197 is an apocalyptic number.

It is an amenable number.

856674197 is a deficient number, since it is larger than the sum of its proper divisors (1).

856674197 is an equidigital number, since it uses as much as digits as its factorization.

856674197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 856674197 is about 29268.9971984009. The cubic root of 856674197 is about 949.7410917717.

The spelling of 856674197 in words is "eight hundred fifty-six million, six hundred seventy-four thousand, one hundred ninety-seven".