198908111 has 2 divisors, whose sum is σ = 198908112. Its totient is φ = 198908110.

The previous prime is 198908081. The next prime is 198908113. The reversal of 198908111 is 111809891.

It is a strong prime.

It is an emirp because it is prime and its reverse (111809891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198908111 - 2¹⁰ = 198907087 is a prime.

Together with 198908113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198908113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99454055 + 99454056.

It is an arithmetic number, because the mean of its divisors is an integer number (99454056).

Almost surely, 2^198908111 is an apocalyptic number.

198908111 is a deficient number, since it is larger than the sum of its proper divisors (1).

198908111 is an equidigital number, since it uses as much as digits as its factorization.

198908111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 38.

The square root of 198908111 is about 14103.4786843530. The cubic root of 198908111 is about 583.7373707695.

The spelling of 198908111 in words is "one hundred ninety-eight million, nine hundred eight thousand, one hundred eleven".