198109137 has 8 divisors (see below), whose sum is σ = 271284736. Its totient is φ = 128503152.

The previous prime is 198109133. The next prime is 198109139. The reversal of 198109137 is 731901891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 198109137 - 2² = 198109133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198109095 and 198109104.

It is not an unprimeable number, because it can be changed into a prime (198109133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 892273 + ... + 892494.

It is an arithmetic number, because the mean of its divisors is an integer number (33910592).

Almost surely, 2^198109137 is an apocalyptic number.

It is an amenable number.

198109137 is a deficient number, since it is larger than the sum of its proper divisors (73175599).

198109137 is a wasteful number, since it uses less digits than its factorization.

198109137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784807.

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 198109137 is about 14075.1247596602. The cubic root of 198109137 is about 582.9547366118.

The spelling of 198109137 in words is "one hundred ninety-eight million, one hundred nine thousand, one hundred thirty-seven".