198922909 has 2 divisors, whose sum is σ = 198922910. Its totient is φ = 198922908.

The previous prime is 198922873. The next prime is 198922931. The reversal of 198922909 is 909229891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141086884 + 57836025 = 11878^2 + 7605^2 .

It is a cyclic number.

It is not a de Polignac number, because 198922909 - 2²¹ = 196825757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198922949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99461454 + 99461455.

It is an arithmetic number, because the mean of its divisors is an integer number (99461455).

Almost surely, 2^198922909 is an apocalyptic number.

It is an amenable number.

198922909 is a deficient number, since it is larger than the sum of its proper divisors (1).

198922909 is an equidigital number, since it uses as much as digits as its factorization.

198922909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 198922909 is about 14104.0032969367. The cubic root of 198922909 is about 583.7518463505.

It can be divided in two parts, 19892 and 2909, that added together give a square (22801 = 151²).

The spelling of 198922909 in words is "one hundred ninety-eight million, nine hundred twenty-two thousand, nine hundred nine".