18108449 has 2 divisors, whose sum is σ = 18108450. Its totient is φ = 18108448.

The previous prime is 18108439. The next prime is 18108481. The reversal of 18108449 is 94480181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 409600 = 4207^2 + 640^2 .

It is a cyclic number.

It is not a de Polignac number, because 18108449 - 2²⁰ = 17059873 is a prime.

It is not a weakly prime, because it can be changed into another prime (18108439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9054224 + 9054225.

It is an arithmetic number, because the mean of its divisors is an integer number (9054225).

Almost surely, 2^18108449 is an apocalyptic number.

It is an amenable number.

18108449 is a deficient number, since it is larger than the sum of its proper divisors (1).

18108449 is an equidigital number, since it uses as much as digits as its factorization.

18108449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 18108449 is about 4255.4023311551. The cubic root of 18108449 is about 262.5994132905.

The spelling of 18108449 in words is "eighteen million, one hundred eight thousand, four hundred forty-nine".