1680617 has 2 divisors, whose sum is σ = 1680618. Its totient is φ = 1680616.

The previous prime is 1680593. The next prime is 1680643. The reversal of 1680617 is 7160861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1628176 + 52441 = 1276^2 + 229^2 .

It is an emirp because it is prime and its reverse (7160861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1680617 - 2⁸ = 1680361 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1680617.

It is not a weakly prime, because it can be changed into another prime (1680647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840308 + 840309.

It is an arithmetic number, because the mean of its divisors is an integer number (840309).

2^1680617 is an apocalyptic number.

It is an amenable number.

1680617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1680617 is an equidigital number, since it uses as much as digits as its factorization.

1680617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1680617 is about 1296.3861307496. The cubic root of 1680617 is about 118.8929904480.

The spelling of 1680617 in words is "one million, six hundred eighty thousand, six hundred seventeen".