198868811 has 2 divisors, whose sum is σ = 198868812. Its totient is φ = 198868810.

The previous prime is 198868807. The next prime is 198868837. The reversal of 198868811 is 118868891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198868811 - 2² = 198868807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198868811.

It is not a weakly prime, because it can be changed into another prime (198868841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99434405 + 99434406.

It is an arithmetic number, because the mean of its divisors is an integer number (99434406).

Almost surely, 2^198868811 is an apocalyptic number.

198868811 is a deficient number, since it is larger than the sum of its proper divisors (1).

198868811 is an equidigital number, since it uses as much as digits as its factorization.

198868811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 50.

The square root of 198868811 is about 14102.0853422464. The cubic root of 198868811 is about 583.6989235528.

The spelling of 198868811 in words is "one hundred ninety-eight million, eight hundred sixty-eight thousand, eight hundred eleven".