856239971 has 2 divisors, whose sum is σ = 856239972. Its totient is φ = 856239970.

The previous prime is 856239953. The next prime is 856240009. The reversal of 856239971 is 179932658.

856239971 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 is a cyclic number.

It is not a de Polignac number, because 856239971 - 2¹⁴ = 856223587 is a prime.

It is not a weakly prime, because it can be changed into another prime (856209971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428119985 + 428119986.

It is an arithmetic number, because the mean of its divisors is an integer number (428119986).

Almost surely, 2^856239971 is an apocalyptic number.

856239971 is a deficient number, since it is larger than the sum of its proper divisors (1).

856239971 is an equidigital number, since it uses as much as digits as its factorization.

856239971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 50.

The square root of 856239971 is about 29261.5784092383. The cubic root of 856239971 is about 949.5805982511.

The spelling of 856239971 in words is "eight hundred fifty-six million, two hundred thirty-nine thousand, nine hundred seventy-one".