199998131 has 2 divisors, whose sum is σ = 199998132. Its totient is φ = 199998130.

The previous prime is 199998107. The next prime is 199998157. The reversal of 199998131 is 131899991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199998131 - 2⁶ = 199998067 is a prime.

It is a super-2 number, since 2×199998131² = 79998504806986322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199998131.

It is not a weakly prime, because it can be changed into another prime (199908131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99999065 + 99999066.

It is an arithmetic number, because the mean of its divisors is an integer number (99999066).

Almost surely, 2^199998131 is an apocalyptic number.

199998131 is a deficient number, since it is larger than the sum of its proper divisors (1).

199998131 is an equidigital number, since it uses as much as digits as its factorization.

199998131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 157464, while the sum is 50.

The square root of 199998131 is about 14142.0695444479. The cubic root of 199998131 is about 584.8017259738.

The spelling of 199998131 in words is "one hundred ninety-nine million, nine hundred ninety-eight thousand, one hundred thirty-one".