199604813 has 2 divisors, whose sum is σ = 199604814. Its totient is φ = 199604812.

The previous prime is 199604759. The next prime is 199604819. The reversal of 199604813 is 318406991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126382564 + 73222249 = 11242^2 + 8557^2 .

It is a cyclic number.

It is not a de Polignac number, because 199604813 - 2¹⁴ = 199588429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199604819) 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, 99802406 + 99802407.

It is an arithmetic number, because the mean of its divisors is an integer number (99802407).

Almost surely, 2^199604813 is an apocalyptic number.

It is an amenable number.

199604813 is a deficient number, since it is larger than the sum of its proper divisors (1).

199604813 is an equidigital number, since it uses as much as digits as its factorization.

199604813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 199604813 is about 14128.1567446005. The cubic root of 199604813 is about 584.4181157356.

The spelling of 199604813 in words is "one hundred ninety-nine million, six hundred four thousand, eight hundred thirteen".