686000000989 has 2 divisors, whose sum is σ = 686000000990. Its totient is φ = 686000000988.

The previous prime is 686000000957. The next prime is 686000001007. The reversal of 686000000989 is 989000000686.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666655920100 + 19344080889 = 816490^2 + 139083^2 .

It is a cyclic number.

It is not a de Polignac number, because 686000000989 - 2⁵ = 686000000957 is a prime.

686000000989 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686000000909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343000000494 + 343000000495.

It is an arithmetic number, because the mean of its divisors is an integer number (343000000495).

Almost surely, 2^686000000989 is an apocalyptic number.

It is an amenable number.

686000000989 is a deficient number, since it is larger than the sum of its proper divisors (1).

686000000989 is an equidigital number, since it uses as much as digits as its factorization.

686000000989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 686000000989 in words is "six hundred eighty-six billion, nine hundred eighty-nine", and thus it is an aban number.