1684509349 has 2 divisors, whose sum is σ = 1684509350. Its totient is φ = 1684509348.

The previous prime is 1684509301. The next prime is 1684509401. The reversal of 1684509349 is 9439054861.

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., 1665864225 + 18645124 = 40815^2 + 4318^2 .

It is an emirp because it is prime and its reverse (9439054861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1684509349 - 2⁷ = 1684509221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684501349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842254674 + 842254675.

It is an arithmetic number, because the mean of its divisors is an integer number (842254675).

Almost surely, 2^1684509349 is an apocalyptic number.

It is an amenable number.

1684509349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684509349 is an equidigital number, since it uses as much as digits as its factorization.

1684509349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1684509349 is about 41042.7746259923. The cubic root of 1684509349 is about 1189.8470601180.

The spelling of 1684509349 in words is "one billion, six hundred eighty-four million, five hundred nine thousand, three hundred forty-nine".