18328549 has 2 divisors, whose sum is σ = 18328550. Its totient is φ = 18328548.

The previous prime is 18328547. The next prime is 18328573. The reversal of 18328549 is 94582381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11437924 + 6890625 = 3382^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 18328549 - 2¹ = 18328547 is a prime.

Together with 18328547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18328547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164274 + 9164275.

It is an arithmetic number, because the mean of its divisors is an integer number (9164275).

Almost surely, 2^18328549 is an apocalyptic number.

It is an amenable number.

18328549 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328549 is an equidigital number, since it uses as much as digits as its factorization.

18328549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 18328549 is about 4281.1854666669. The cubic root of 18328549 is about 263.6590573158.

The spelling of 18328549 in words is "eighteen million, three hundred twenty-eight thousand, five hundred forty-nine".