198519209 has 4 divisors (see below), whose sum is σ = 226879104. Its totient is φ = 170159316.

The previous prime is 198519169. The next prime is 198519229. The reversal of 198519209 is 902915891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 198519209 - 2⁸ = 198518953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198519209.

It is not an unprimeable number, because it can be changed into a prime (198519229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14179937 + ... + 14179950.

It is an arithmetic number, because the mean of its divisors is an integer number (56719776).

Almost surely, 2^198519209 is an apocalyptic number.

It is an amenable number.

198519209 is a deficient number, since it is larger than the sum of its proper divisors (28359895).

198519209 is an equidigital number, since it uses as much as digits as its factorization.

198519209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28359894.

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 198519209 is about 14089.6844890154. The cubic root of 198519209 is about 583.3566845255.

The spelling of 198519209 in words is "one hundred ninety-eight million, five hundred nineteen thousand, two hundred nine".