198517089 has 4 divisors (see below), whose sum is σ = 264689456. Its totient is φ = 132344724.

The previous prime is 198517063. The next prime is 198517091. The reversal of 198517089 is 980715891.

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, and also an emirpimes, since its reverse is a distinct semiprime: 980715891 = 3 ⋅326905297.

It is not a de Polignac number, because 198517089 - 2⁵ = 198517057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198517009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33086179 + ... + 33086184.

It is an arithmetic number, because the mean of its divisors is an integer number (66172364).

Almost surely, 2^198517089 is an apocalyptic number.

It is an amenable number.

198517089 is a deficient number, since it is larger than the sum of its proper divisors (66172367).

198517089 is an equidigital number, since it uses as much as digits as its factorization.

198517089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66172366.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 198517089 is about 14089.6092564698. The cubic root of 198517089 is about 583.3546079497.

The spelling of 198517089 in words is "one hundred ninety-eight million, five hundred seventeen thousand, eighty-nine".