198901089 has 16 divisors (see below), whose sum is σ = 298309440. Its totient is φ = 132599268.

The previous prime is 198901069. The next prime is 198901181. The reversal of 198901089 is 980109891.

It is not a de Polignac number, because 198901089 - 2⁵ = 198901057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198901009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43287 + ... + 47660.

It is an arithmetic number, because the mean of its divisors is an integer number (18644340).

Almost surely, 2^198901089 is an apocalyptic number.

It is an amenable number.

198901089 is a deficient number, since it is larger than the sum of its proper divisors (99408351).

198901089 is an frugal number, since it uses more digits than its factorization.

198901089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90968 (or 90950 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 198901089 is about 14103.2297364823. The cubic root of 198901089 is about 583.7305015137.

The spelling of 198901089 in words is "one hundred ninety-eight million, nine hundred one thousand, eighty-nine".