686317 has 2 divisors, whose sum is σ = 686318. Its totient is φ = 686316.

The previous prime is 686293. The next prime is 686321. The reversal of 686317 is 713686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 561001 + 125316 = 749^2 + 354^2 .

It is a cyclic number.

It is not a de Polignac number, because 686317 - 2¹¹ = 684269 is a 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 (686117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343158 + 343159.

It is an arithmetic number, because the mean of its divisors is an integer number (343159).

2⁶⁸⁶³¹⁷ is an apocalyptic number.

It is an amenable number.

686317 is a deficient number, since it is larger than the sum of its proper divisors (1).

686317 is an equidigital number, since it uses as much as digits as its factorization.

686317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 686317 is about 828.4425146019. The cubic root of 686317 is about 88.2080562637.

The spelling of 686317 in words is "six hundred eighty-six thousand, three hundred seventeen".