686910089 has 2 divisors, whose sum is σ = 686910090. Its totient is φ = 686910088.

The previous prime is 686910083. The next prime is 686910131. The reversal of 686910089 is 980019686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 669101689 + 17808400 = 25867^2 + 4220^2 .

It is a cyclic number.

It is not a de Polignac number, because 686910089 - 2⁴ = 686910073 is a prime.

It is not a weakly prime, because it can be changed into another prime (686910083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343455044 + 343455045.

It is an arithmetic number, because the mean of its divisors is an integer number (343455045).

Almost surely, 2^686910089 is an apocalyptic number.

It is an amenable number.

686910089 is a deficient number, since it is larger than the sum of its proper divisors (1).

686910089 is an equidigital number, since it uses as much as digits as its factorization.

686910089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 686910089 is about 26208.9696287359. The cubic root of 686910089 is about 882.3345762850.

The spelling of 686910089 in words is "six hundred eighty-six million, nine hundred ten thousand, eighty-nine".