18044549 has 2 divisors, whose sum is σ = 18044550. Its totient is φ = 18044548.

The previous prime is 18044519. The next prime is 18044557. The reversal of 18044549 is 94544081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16240900 + 1803649 = 4030^2 + 1343^2 .

It is an emirp because it is prime and its reverse (94544081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18044549 is a prime.

It is a super-2 number, since 2×18044549² = 651211497226802, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18044519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9022274 + 9022275.

It is an arithmetic number, because the mean of its divisors is an integer number (9022275).

Almost surely, 2^18044549 is an apocalyptic number.

It is an amenable number.

18044549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18044549 is an equidigital number, since it uses as much as digits as its factorization.

18044549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 18044549 is about 4247.8875926747. The cubic root of 18044549 is about 262.2901676113.

The spelling of 18044549 in words is "eighteen million, forty-four thousand, five hundred forty-nine".