18218411 has 2 divisors, whose sum is σ = 18218412. Its totient is φ = 18218410.

The previous prime is 18218401. The next prime is 18218413. The reversal of 18218411 is 11481281.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18218411 is a prime.

Together with 18218413, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18218413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109205 + 9109206.

It is an arithmetic number, because the mean of its divisors is an integer number (9109206).

Almost surely, 2^18218411 is an apocalyptic number.

18218411 is a deficient number, since it is larger than the sum of its proper divisors (1).

18218411 is an equidigital number, since it uses as much as digits as its factorization.

18218411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 26.

The square root of 18218411 is about 4268.3030585937. The cubic root of 18218411 is about 263.1298784553.

Adding to 18218411 its reverse (11481281), we get a palindrome (29699692).

The spelling of 18218411 in words is "eighteen million, two hundred eighteen thousand, four hundred eleven".