199820213 has 2 divisors, whose sum is σ = 199820214. Its totient is φ = 199820212.

The previous prime is 199820209. The next prime is 199820249. The reversal of 199820213 is 312028991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177475684 + 22344529 = 13322^2 + 4727^2 .

It is a cyclic number.

It is not a de Polignac number, because 199820213 - 2² = 199820209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_11069486 and since 199820213 and 11069486 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199820713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99910106 + 99910107.

It is an arithmetic number, because the mean of its divisors is an integer number (99910107).

Almost surely, 2^199820213 is an apocalyptic number.

It is an amenable number.

199820213 is a deficient number, since it is larger than the sum of its proper divisors (1).

199820213 is an equidigital number, since it uses as much as digits as its factorization.

199820213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 199820213 is about 14135.7777642406. Note that the first 4 decimals coincide. The cubic root of 199820213 is about 584.6282616495.

The spelling of 199820213 in words is "one hundred ninety-nine million, eight hundred twenty thousand, two hundred thirteen".