199318139 has 2 divisors, whose sum is σ = 199318140. Its totient is φ = 199318138.

The previous prime is 199318129. The next prime is 199318157. The reversal of 199318139 is 931813991.

It is a weak prime.

It is an emirp because it is prime and its reverse (931813991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199318139 - 2⁸ = 199317883 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199318139.

It is not a weakly prime, because it can be changed into another prime (199318129) 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, 99659069 + 99659070.

It is an arithmetic number, because the mean of its divisors is an integer number (99659070).

Almost surely, 2^199318139 is an apocalyptic number.

199318139 is a deficient number, since it is larger than the sum of its proper divisors (1).

199318139 is an equidigital number, since it uses as much as digits as its factorization.

199318139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 44.

The square root of 199318139 is about 14118.0076143909. The cubic root of 199318139 is about 584.1381997244.

The spelling of 199318139 in words is "one hundred ninety-nine million, three hundred eighteen thousand, one hundred thirty-nine".