199999811 has 6 divisors (see below), whose sum is σ = 219834636. Its totient is φ = 181817900.

The previous prime is 199999777. The next prime is 199999819. The reversal of 199999811 is 118999991.

It is a de Polignac number, because none of the positive numbers 2^k-199999811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199999819) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 826325 + ... + 826566.

It is an arithmetic number, because the mean of its divisors is an integer number (36639106).

Almost surely, 2^199999811 is an apocalyptic number.

199999811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

199999811 is a deficient number, since it is larger than the sum of its proper divisors (19834825).

199999811 is a wasteful number, since it uses less digits than its factorization.

199999811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652913 (or 1652902 counting only the distinct ones).

The product of its digits is 472392, while the sum is 56.

The square root of 199999811 is about 14142.1289415703. The cubic root of 199999811 is about 584.8033634294.

The spelling of 199999811 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, eight hundred eleven".