198115191 has 6 divisors (see below), whose sum is σ = 286166400. Its totient is φ = 132076788.

The previous prime is 198115133. The next prime is 198115213. The reversal of 198115191 is 191511891.

It is a de Polignac number, because none of the positive numbers 2^k-198115191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198115111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11006391 + ... + 11006408.

It is an arithmetic number, because the mean of its divisors is an integer number (47694400).

Almost surely, 2^198115191 is an apocalyptic number.

198115191 is a deficient number, since it is larger than the sum of its proper divisors (88051209).

198115191 is a wasteful number, since it uses less digits than its factorization.

198115191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22012805 (or 22012802 counting only the distinct ones).

The product of its digits is 3240, while the sum is 36.

The square root of 198115191 is about 14075.3398182779. The cubic root of 198115191 is about 582.9606747058.

The spelling of 198115191 in words is "one hundred ninety-eight million, one hundred fifteen thousand, one hundred ninety-one".