198811 has 2 divisors, whose sum is σ = 198812. Its totient is φ = 198810.

The previous prime is 198769. The next prime is 198817. The reversal of 198811 is 118891.

It is a strong prime.

It is an emirp because it is prime and its reverse (118891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198811 - 2¹⁵ = 166043 is a prime.

It is a Chen prime.

198811 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 198811.

It is not a weakly prime, because it can be changed into another prime (198817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99405 + 99406.

It is an arithmetic number, because the mean of its divisors is an integer number (99406).

2¹⁹⁸⁸¹¹ is an apocalyptic number.

198811 is a deficient number, since it is larger than the sum of its proper divisors (1).

198811 is an equidigital number, since it uses as much as digits as its factorization.

198811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 28.

The square root of 198811 is about 445.8822714574. The cubic root of 198811 is about 58.3642357805.

The spelling of 198811 in words is "one hundred ninety-eight thousand, eight hundred eleven".