198072209 has 2 divisors, whose sum is σ = 198072210. Its totient is φ = 198072208.

The previous prime is 198072191. The next prime is 198072223. The reversal of 198072209 is 902270891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113891584 + 84180625 = 10672^2 + 9175^2 .

It is a cyclic number.

It is not a de Polignac number, because 198072209 - 2¹² = 198068113 is a prime.

It is not a weakly prime, because it can be changed into another prime (198072229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99036104 + 99036105.

It is an arithmetic number, because the mean of its divisors is an integer number (99036105).

Almost surely, 2^198072209 is an apocalyptic number.

It is an amenable number.

198072209 is a deficient number, since it is larger than the sum of its proper divisors (1).

198072209 is an equidigital number, since it uses as much as digits as its factorization.

198072209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 198072209 is about 14073.8128806660. The cubic root of 198072209 is about 582.9185129919.

The spelling of 198072209 in words is "one hundred ninety-eight million, seventy-two thousand, two hundred nine".