856882139 has 2 divisors, whose sum is σ = 856882140. Its totient is φ = 856882138.

The previous prime is 856882133. The next prime is 856882153. The reversal of 856882139 is 931288658.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856882139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (856882133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428441069 + 428441070.

It is an arithmetic number, because the mean of its divisors is an integer number (428441070).

Almost surely, 2^856882139 is an apocalyptic number.

856882139 is a deficient number, since it is larger than the sum of its proper divisors (1).

856882139 is an equidigital number, since it uses as much as digits as its factorization.

856882139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 50.

The square root of 856882139 is about 29272.5492398595. The cubic root of 856882139 is about 949.8179296508.

The spelling of 856882139 in words is "eight hundred fifty-six million, eight hundred eighty-two thousand, one hundred thirty-nine".