856631597 has 2 divisors, whose sum is σ = 856631598. Its totient is φ = 856631596.

The previous prime is 856631537. The next prime is 856631599. The reversal of 856631597 is 795136658.

It is a happy number.

856631597 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472236361 + 384395236 = 21731^2 + 19606^2 .

It is a cyclic number.

It is not a de Polignac number, because 856631597 - 2²⁶ = 789522733 is a prime.

Together with 856631599, 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 (856631599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428315798 + 428315799.

It is an arithmetic number, because the mean of its divisors is an integer number (428315799).

Almost surely, 2^856631597 is an apocalyptic number.

It is an amenable number.

856631597 is a deficient number, since it is larger than the sum of its proper divisors (1).

856631597 is an equidigital number, since it uses as much as digits as its factorization.

856631597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The square root of 856631597 is about 29268.2694568709. The cubic root of 856631597 is about 949.7253488591.

The spelling of 856631597 in words is "eight hundred fifty-six million, six hundred thirty-one thousand, five hundred ninety-seven".