199995811 has 2 divisors, whose sum is σ = 199995812. Its totient is φ = 199995810.

The previous prime is 199995797. The next prime is 199995839. The reversal of 199995811 is 118599991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 199995811 - 2¹⁷ = 199864739 is a prime.

It is not a weakly prime, because it can be changed into another prime (199995611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99997905 + 99997906.

It is an arithmetic number, because the mean of its divisors is an integer number (99997906).

Almost surely, 2^199995811 is an apocalyptic number.

199995811 is a deficient number, since it is larger than the sum of its proper divisors (1).

199995811 is an equidigital number, since it uses as much as digits as its factorization.

199995811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 52.

The square root of 199995811 is about 14141.9875194401. The cubic root of 199995811 is about 584.7994647106.

The spelling of 199995811 in words is "one hundred ninety-nine million, nine hundred ninety-five thousand, eight hundred eleven".