198945109 has 8 divisors (see below), whose sum is σ = 220710240. Its totient is φ = 177793200.

The previous prime is 198945083. The next prime is 198945113. The reversal of 198945109 is 901549891.

198945109 = 197² + 198² + ... + 845².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198945109 - 2⁵ = 198945077 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 (198945139) 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 in 7 ways as a sum of consecutive naturals, for example, 152622 + ... + 153919.

It is an arithmetic number, because the mean of its divisors is an integer number (27588780).

Almost surely, 2^198945109 is an apocalyptic number.

It is an amenable number.

198945109 is a deficient number, since it is larger than the sum of its proper divisors (21765131).

198945109 is a wasteful number, since it uses less digits than its factorization.

198945109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306611.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 198945109 is about 14104.7902855732. The cubic root of 198945109 is about 583.7735613103.

The spelling of 198945109 in words is "one hundred ninety-eight million, nine hundred forty-five thousand, one hundred nine".