686098813 has 2 divisors, whose sum is σ = 686098814. Its totient is φ = 686098812.

The previous prime is 686098799. The next prime is 686098871. The reversal of 686098813 is 318890686.

686098813 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 can be written as a sum of positive squares in only one way, i.e., 500103769 + 185995044 = 22363^2 + 13638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686098813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686098013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343049406 + 343049407.

It is an arithmetic number, because the mean of its divisors is an integer number (343049407).

Almost surely, 2^686098813 is an apocalyptic number.

It is an amenable number.

686098813 is a deficient number, since it is larger than the sum of its proper divisors (1).

686098813 is an equidigital number, since it uses as much as digits as its factorization.

686098813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 686098813 is about 26193.4879884295. The cubic root of 686098813 is about 881.9870786684.

The spelling of 686098813 in words is "six hundred eighty-six million, ninety-eight thousand, eight hundred thirteen".