1685317 has 2 divisors, whose sum is σ = 1685318. Its totient is φ = 1685316.

The previous prime is 1685297. The next prime is 1685323. The reversal of 1685317 is 7135861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1560001 + 125316 = 1249^2 + 354^2 .

It is an emirp because it is prime and its reverse (7135861) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1685317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842658 + 842659.

It is an arithmetic number, because the mean of its divisors is an integer number (842659).

2^1685317 is an apocalyptic number.

It is an amenable number.

1685317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685317 is an equidigital number, since it uses as much as digits as its factorization.

1685317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 1685317 is about 1298.1975966701. The cubic root of 1685317 is about 119.0037190185.

It can be divided in two parts, 1685 and 317, that added together give a palindrome (2002).

The spelling of 1685317 in words is "one million, six hundred eighty-five thousand, three hundred seventeen".