1684486813 has 2 divisors, whose sum is σ = 1684486814. Its totient is φ = 1684486812.

The previous prime is 1684486799. The next prime is 1684486829. The reversal of 1684486813 is 3186844861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 995844249 + 688642564 = 31557^2 + 26242^2 .

It is an emirp because it is prime and its reverse (3186844861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1684486813 - 2⁹ = 1684486301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1684486883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842243406 + 842243407.

It is an arithmetic number, because the mean of its divisors is an integer number (842243407).

Almost surely, 2^1684486813 is an apocalyptic number.

It is an amenable number.

1684486813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1684486813 is an equidigital number, since it uses as much as digits as its factorization.

1684486813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 49.

The square root of 1684486813 is about 41042.5000822318. The cubic root of 1684486813 is about 1189.8417540204.

The spelling of 1684486813 in words is "one billion, six hundred eighty-four million, four hundred eighty-six thousand, eight hundred thirteen".