18016549 has 12 divisors (see below), whose sum is σ = 19765888. Its totient is φ = 16401600.

The previous prime is 18016547. The next prime is 18016571. The reversal of 18016549 is 94561081.

It is not a de Polignac number, because 18016549 - 2¹ = 18016547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18016543) 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 in 11 ways as a sum of consecutive naturals, for example, 7954 + ... + 9964.

Almost surely, 2^18016549 is an apocalyptic number.

It is an amenable number.

18016549 is a deficient number, since it is larger than the sum of its proper divisors (1749339).

18016549 is a wasteful number, since it uses less digits than its factorization.

18016549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076 (or 2059 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18016549 is about 4244.5905574036. The cubic root of 18016549 is about 262.1544308369.

The spelling of 18016549 in words is "eighteen million, sixteen thousand, five hundred forty-nine".