18108149 has 2 divisors, whose sum is σ = 18108150. Its totient is φ = 18108148.

The previous prime is 18108131. The next prime is 18108163. The reversal of 18108149 is 94180181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 552049 = 4190^2 + 743^2 .

It is an emirp because it is prime and its reverse (94180181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18108149 - 2²⁰ = 17059573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18108109) 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, 9054074 + 9054075.

It is an arithmetic number, because the mean of its divisors is an integer number (9054075).

Almost surely, 2^18108149 is an apocalyptic number.

It is an amenable number.

18108149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18108149 is an equidigital number, since it uses as much as digits as its factorization.

18108149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 32.

The square root of 18108149 is about 4255.3670816981. The cubic root of 18108149 is about 262.5979631340.

The spelling of 18108149 in words is "eighteen million, one hundred eight thousand, one hundred forty-nine".