198328191 has 4 divisors (see below), whose sum is σ = 264437592. Its totient is φ = 132218792.

The previous prime is 198328183. The next prime is 198328199. The reversal of 198328191 is 191823891.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (198328183) and next prime (198328199).

It is a cyclic number.

It is not a de Polignac number, because 198328191 - 2³ = 198328183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198328199) 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, 33054696 + ... + 33054701.

It is an arithmetic number, because the mean of its divisors is an integer number (66109398).

Almost surely, 2^198328191 is an apocalyptic number.

198328191 is a deficient number, since it is larger than the sum of its proper divisors (66109401).

198328191 is an equidigital number, since it uses as much as digits as its factorization.

198328191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66109400.

The product of its digits is 31104, while the sum is 42.

The square root of 198328191 is about 14082.9042104248. The cubic root of 198328191 is about 583.1695197885.

The spelling of 198328191 in words is "one hundred ninety-eight million, three hundred twenty-eight thousand, one hundred ninety-one".