18000811 has 2 divisors, whose sum is σ = 18000812. Its totient is φ = 18000810.

The previous prime is 18000803. The next prime is 18000817. The reversal of 18000811 is 11800081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18000811 - 2³ = 18000803 is a prime.

It is a Chen prime.

It is equal to p_1151416 and since 18000811 and 1151416 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18000817) 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, 9000405 + 9000406.

It is an arithmetic number, because the mean of its divisors is an integer number (9000406).

Almost surely, 2^18000811 is an apocalyptic number.

18000811 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000811 is an equidigital number, since it uses as much as digits as its factorization.

18000811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 18000811 is about 4242.7362633093. The cubic root of 18000811 is about 262.0780753271.

Adding to 18000811 its reverse (11800081), we get a palindrome (29800892).

The spelling of 18000811 in words is "eighteen million, eight hundred eleven", and thus it is an aban number.