199906199 has 2 divisors, whose sum is σ = 199906200. Its totient is φ = 199906198.

The previous prime is 199906177. The next prime is 199906229. The reversal of 199906199 is 991609991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199906199 - 2¹² = 199902103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199906199.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199906129) 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, 99953099 + 99953100.

It is an arithmetic number, because the mean of its divisors is an integer number (99953100).

Almost surely, 2^199906199 is an apocalyptic number.

199906199 is a deficient number, since it is larger than the sum of its proper divisors (1).

199906199 is an equidigital number, since it uses as much as digits as its factorization.

199906199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 354294, while the sum is 53.

The square root of 199906199 is about 14138.8188686326. The cubic root of 199906199 is about 584.7121080833.

The spelling of 199906199 in words is "one hundred ninety-nine million, nine hundred six thousand, one hundred ninety-nine".