199129187 has 2 divisors, whose sum is σ = 199129188. Its totient is φ = 199129186.

The previous prime is 199129127. The next prime is 199129199. The reversal of 199129187 is 781921991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 199129187 - 2²⁰ = 198080611 is a prime.

It is not a weakly prime, because it can be changed into another prime (199129127) 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, 99564593 + 99564594.

It is an arithmetic number, because the mean of its divisors is an integer number (99564594).

Almost surely, 2^199129187 is an apocalyptic number.

199129187 is a deficient number, since it is larger than the sum of its proper divisors (1).

199129187 is an equidigital number, since it uses as much as digits as its factorization.

199129187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 47.

The square root of 199129187 is about 14111.3141485830. The cubic root of 199129187 is about 583.9535552527.

The spelling of 199129187 in words is "one hundred ninety-nine million, one hundred twenty-nine thousand, one hundred eighty-seven".