198532782989 has 2 divisors, whose sum is σ = 198532782990. Its totient is φ = 198532782988.

The previous prime is 198532782953. The next prime is 198532782991. The reversal of 198532782989 is 989287235891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195178404100 + 3354378889 = 441790^2 + 57917^2 .

It is a cyclic number.

It is not a de Polignac number, because 198532782989 - 2¹² = 198532778893 is a prime.

Together with 198532782991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198532782919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99266391494 + 99266391495.

It is an arithmetic number, because the mean of its divisors is an integer number (99266391495).

Almost surely, 2^198532782989 is an apocalyptic number.

It is an amenable number.

198532782989 is a deficient number, since it is larger than the sum of its proper divisors (1).

198532782989 is an equidigital number, since it uses as much as digits as its factorization.

198532782989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156764160, while the sum is 71.

The spelling of 198532782989 in words is "one hundred ninety-eight billion, five hundred thirty-two million, seven hundred eighty-two thousand, nine hundred eighty-nine".