198016009 has 2 divisors, whose sum is σ = 198016010. Its totient is φ = 198016008.

The previous prime is 198015997. The next prime is 198016037. The reversal of 198016009 is 900610891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135210384 + 62805625 = 11628^2 + 7925^2 .

It is an emirp because it is prime and its reverse (900610891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198016009 - 2²¹ = 195918857 is a prime.

It is not a weakly prime, because it can be changed into another prime (198016099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99008004 + 99008005.

It is an arithmetic number, because the mean of its divisors is an integer number (99008005).

Almost surely, 2^198016009 is an apocalyptic number.

It is an amenable number.

198016009 is a deficient number, since it is larger than the sum of its proper divisors (1).

198016009 is an equidigital number, since it uses as much as digits as its factorization.

198016009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 198016009 is about 14071.8161230170. The cubic root of 198016009 is about 582.8633763333.

The spelling of 198016009 in words is "one hundred ninety-eight million, sixteen thousand, nine".