198940099 has 2 divisors, whose sum is σ = 198940100. Its totient is φ = 198940098.

The previous prime is 198940097. The next prime is 198940109. The reversal of 198940099 is 990049891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198940099 - 2¹ = 198940097 is a prime.

Together with 198940097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (198940097) 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, 99470049 + 99470050.

It is an arithmetic number, because the mean of its divisors is an integer number (99470050).

Almost surely, 2^198940099 is an apocalyptic number.

198940099 is a deficient number, since it is larger than the sum of its proper divisors (1).

198940099 is an equidigital number, since it uses as much as digits as its factorization.

198940099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 198940099 is about 14104.6126852176. The cubic root of 198940099 is about 583.7686609132.

The spelling of 198940099 in words is "one hundred ninety-eight million, nine hundred forty thousand, ninety-nine".