1684820317 has 2 divisors, whose sum is σ = 1684820318. Its totient is φ = 1684820316.

The previous prime is 1684820299. The next prime is 1684820329. The reversal of 1684820317 is 7130284861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 861187716 + 823632601 = 29346^2 + 28699^2 .

It is a cyclic number.

It is not a de Polignac number, because 1684820317 - 2¹⁵ = 1684787549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1684820317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684820617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842410158 + 842410159.

It is an arithmetic number, because the mean of its divisors is an integer number (842410159).

Almost surely, 2^1684820317 is an apocalyptic number.

It is an amenable number.

1684820317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684820317 is an equidigital number, since it uses as much as digits as its factorization.

1684820317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 1684820317 is about 41046.5627915420. The cubic root of 1684820317 is about 1189.9202726521.

The spelling of 1684820317 in words is "one billion, six hundred eighty-four million, eight hundred twenty thousand, three hundred seventeen".