198109109 has 16 divisors (see below), whose sum is σ = 230993856. Its totient is φ = 167904000.

The previous prime is 198109103. The next prime is 198109111. The reversal of 198109109 is 901901891.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-198109109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198109103) 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 in 15 ways as a sum of consecutive naturals, for example, 15059 + ... + 24959.

It is an arithmetic number, because the mean of its divisors is an integer number (14437116).

Almost surely, 2^198109109 is an apocalyptic number.

It is an amenable number.

198109109 is a deficient number, since it is larger than the sum of its proper divisors (32884747).

198109109 is a wasteful number, since it uses less digits than its factorization.

198109109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10036.

The product of its (nonzero) digits is 5832, while the sum is 38.

The square root of 198109109 is about 14075.1237649976. The cubic root of 198109109 is about 582.9547091476.

The spelling of 198109109 in words is "one hundred ninety-eight million, one hundred nine thousand, one hundred nine".