198692489 has 2 divisors, whose sum is σ = 198692490. Its totient is φ = 198692488.

The previous prime is 198692477. The next prime is 198692491. The reversal of 198692489 is 984296891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187690000 + 11002489 = 13700^2 + 3317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198692489 is a prime.

Together with 198692491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198692089) 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, 99346244 + 99346245.

It is an arithmetic number, because the mean of its divisors is an integer number (99346245).

Almost surely, 2^198692489 is an apocalyptic number.

It is an amenable number.

198692489 is a deficient number, since it is larger than the sum of its proper divisors (1).

198692489 is an equidigital number, since it uses as much as digits as its factorization.

198692489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2239488, while the sum is 56.

The square root of 198692489 is about 14095.8323273229. The cubic root of 198692489 is about 583.5263652502.

The spelling of 198692489 in words is "one hundred ninety-eight million, six hundred ninety-two thousand, four hundred eighty-nine".