198206089 has 2 divisors, whose sum is σ = 198206090. Its totient is φ = 198206088.

The previous prime is 198206087. The next prime is 198206117. The reversal of 198206089 is 980602891.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137241225 + 60964864 = 11715^2 + 7808^2 .

It is a cyclic number.

It is not a de Polignac number, because 198206089 - 2¹ = 198206087 is a prime.

Together with 198206087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (198206087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99103044 + 99103045.

It is an arithmetic number, because the mean of its divisors is an integer number (99103045).

Almost surely, 2^198206089 is an apocalyptic number.

It is an amenable number.

198206089 is a deficient number, since it is larger than the sum of its proper divisors (1).

198206089 is an equidigital number, since it uses as much as digits as its factorization.

198206089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 198206089 is about 14078.5684286436. The cubic root of 198206089 is about 583.0498178907.

The spelling of 198206089 in words is "one hundred ninety-eight million, two hundred six thousand, eighty-nine".