18317811 has 4 divisors (see below), whose sum is σ = 24423752. Its totient is φ = 12211872.

The previous prime is 18317801. The next prime is 18317813. The reversal of 18317811 is 11871381.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18317811 - 2⁵ = 18317779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18317813) 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 in 3 ways as a sum of consecutive naturals, for example, 3052966 + ... + 3052971.

It is an arithmetic number, because the mean of its divisors is an integer number (6105938).

Almost surely, 2^18317811 is an apocalyptic number.

18317811 is a deficient number, since it is larger than the sum of its proper divisors (6105941).

18317811 is an equidigital number, since it uses as much as digits as its factorization.

18317811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105940.

The product of its digits is 1344, while the sum is 30.

The square root of 18317811 is about 4279.9311910357. The cubic root of 18317811 is about 263.6075579849.

The spelling of 18317811 in words is "eighteen million, three hundred seventeen thousand, eight hundred eleven".