198969611 has 2 divisors, whose sum is σ = 198969612. Its totient is φ = 198969610.

The previous prime is 198969599. The next prime is 198969613. The reversal of 198969611 is 116969891.

It is a strong prime.

It is an emirp because it is prime and its reverse (116969891) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 119696861 and 168696911.

It is a cyclic number.

It is not a de Polignac number, because 198969611 - 2¹⁰ = 198968587 is a prime.

It is a super-2 number, since 2×198969611² = 79177812202982642, which contains 22 as substring.

Together with 198969613, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198969611.

It is not a weakly prime, because it can be changed into another prime (198969613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99484805 + 99484806.

It is an arithmetic number, because the mean of its divisors is an integer number (99484806).

Almost surely, 2^198969611 is an apocalyptic number.

198969611 is a deficient number, since it is larger than the sum of its proper divisors (1).

198969611 is an equidigital number, since it uses as much as digits as its factorization.

198969611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 50.

The square root of 198969611 is about 14105.6588289948. The cubic root of 198969611 is about 583.7975260992.

The spelling of 198969611 in words is "one hundred ninety-eight million, nine hundred sixty-nine thousand, six hundred eleven".