18190811 has 2 divisors, whose sum is σ = 18190812. Its totient is φ = 18190810.

The previous prime is 18190793. The next prime is 18190841. The reversal of 18190811 is 11809181.

It is a weak prime.

It is an emirp because it is prime and its reverse (11809181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18190811 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18190841) 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, 9095405 + 9095406.

It is an arithmetic number, because the mean of its divisors is an integer number (9095406).

Almost surely, 2^18190811 is an apocalyptic number.

18190811 is a deficient number, since it is larger than the sum of its proper divisors (1).

18190811 is an equidigital number, since it uses as much as digits as its factorization.

18190811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 29.

The square root of 18190811 is about 4265.0686981572. The cubic root of 18190811 is about 262.9969350074.

Adding to 18190811 its reverse (11809181), we get a palindrome (29999992).

The spelling of 18190811 in words is "eighteen million, one hundred ninety thousand, eight hundred eleven".