1680317 has 2 divisors, whose sum is σ = 1680318. Its totient is φ = 1680316.

The previous prime is 1680313. The next prime is 1680319. The reversal of 1680317 is 7130861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1503076 + 177241 = 1226^2 + 421^2 .

It is an emirp because it is prime and its reverse (7130861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1680317 - 2² = 1680313 is a prime.

Together with 1680319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1680313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840158 + 840159.

It is an arithmetic number, because the mean of its divisors is an integer number (840159).

2^1680317 is an apocalyptic number.

It is an amenable number.

1680317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680317 is an equidigital number, since it uses as much as digits as its factorization.

1680317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1680317 is about 1296.2704193184. The cubic root of 1680317 is about 118.8859156615.

The spelling of 1680317 in words is "one million, six hundred eighty thousand, three hundred seventeen".