18416549 has 4 divisors (see below), whose sum is σ = 18540300. Its totient is φ = 18292800.

The previous prime is 18416543. The next prime is 18416551. The reversal of 18416549 is 94561481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94561481 = 7 ⋅13508783.

It can be written as a sum of positive squares in 2 ways, for example, as 11356900 + 7059649 = 3370^2 + 2657^2 .

It is a cyclic number.

It is not a de Polignac number, because 18416549 - 2⁴ = 18416533 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 (18416543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61652 + ... + 61949.

It is an arithmetic number, because the mean of its divisors is an integer number (4635075).

Almost surely, 2^18416549 is an apocalyptic number.

It is an amenable number.

18416549 is a deficient number, since it is larger than the sum of its proper divisors (123751).

18416549 is a wasteful number, since it uses less digits than its factorization.

18416549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123750.

The product of its digits is 34560, while the sum is 38.

The square root of 18416549 is about 4291.4506871220. The cubic root of 18416549 is about 264.0803484008.

The spelling of 18416549 in words is "eighteen million, four hundred sixteen thousand, five hundred forty-nine".