198315909 has 12 divisors (see below), whose sum is σ = 312497952. Its totient is φ = 120191400.

The previous prime is 198315881. The next prime is 198315917. The reversal of 198315909 is 909513891.

198315909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198315909 - 2⁷ = 198315781 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198315979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1001497 + ... + 1001694.

It is an arithmetic number, because the mean of its divisors is an integer number (26041496).

Almost surely, 2^198315909 is an apocalyptic number.

It is an amenable number.

198315909 is a deficient number, since it is larger than the sum of its proper divisors (114182043).

198315909 is a wasteful number, since it uses less digits than its factorization.

198315909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003208 (or 2003205 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 198315909 is about 14082.4681430494. The cubic root of 198315909 is about 583.1574814329.

The spelling of 198315909 in words is "one hundred ninety-eight million, three hundred fifteen thousand, nine hundred nine".