687317 has 2 divisors, whose sum is σ = 687318. Its totient is φ = 687316.

The previous prime is 687311. The next prime is 687331. The reversal of 687317 is 713786.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 682276 + 5041 = 826^2 + 71^2 .

It is a cyclic number.

It is not a de Polignac number, because 687317 - 2⁸ = 687061 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687317.

It is not a weakly prime, because it can be changed into another prime (687311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343658 + 343659.

It is an arithmetic number, because the mean of its divisors is an integer number (343659).

2⁶⁸⁷³¹⁷ is an apocalyptic number.

It is an amenable number.

687317 is a deficient number, since it is larger than the sum of its proper divisors (1).

687317 is an equidigital number, since it uses as much as digits as its factorization.

687317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 687317 is about 829.0458370923. The cubic root of 687317 is about 88.2508767337.

The spelling of 687317 in words is "six hundred eighty-seven thousand, three hundred seventeen".