686856983 has 2 divisors, whose sum is σ = 686856984. Its totient is φ = 686856982.

The previous prime is 686856979. The next prime is 686857009. The reversal of 686856983 is 389658686.

686856983 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 686856983 - 2² = 686856979 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686856913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343428491 + 343428492.

It is an arithmetic number, because the mean of its divisors is an integer number (343428492).

Almost surely, 2^686856983 is an apocalyptic number.

686856983 is a deficient number, since it is larger than the sum of its proper divisors (1).

686856983 is an equidigital number, since it uses as much as digits as its factorization.

686856983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14929920, while the sum is 59.

The square root of 686856983 is about 26207.9564827172. The cubic root of 686856983 is about 882.3118375170.

The spelling of 686856983 in words is "six hundred eighty-six million, eight hundred fifty-six thousand, nine hundred eighty-three".