686098909 has 2 divisors, whose sum is σ = 686098910. Its totient is φ = 686098908.

The previous prime is 686098871. The next prime is 686098943. The reversal of 686098909 is 909890686.

686098909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373339684 + 312759225 = 19322^2 + 17685^2 .

It is a cyclic number.

It is not a de Polignac number, because 686098909 - 2⁹ = 686098397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686098909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686098969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343049454 + 343049455.

It is an arithmetic number, because the mean of its divisors is an integer number (343049455).

Almost surely, 2^686098909 is an apocalyptic number.

It is an amenable number.

686098909 is a deficient number, since it is larger than the sum of its proper divisors (1).

686098909 is an equidigital number, since it uses as much as digits as its factorization.

686098909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 686098909 is about 26193.4898209460. The cubic root of 686098909 is about 881.9871198048.

The spelling of 686098909 in words is "six hundred eighty-six million, ninety-eight thousand, nine hundred nine".