18249541 has 4 divisors (see below), whose sum is σ = 18274284. Its totient is φ = 18224800.

The previous prime is 18249529. The next prime is 18249563. The reversal of 18249541 is 14594281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16641 + 18232900 = 129^2 + 4270^2 .

It is a cyclic number.

It is not a de Polignac number, because 18249541 - 2⁵ = 18249509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18249497 and 18249506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18249521) 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 in 3 ways as a sum of consecutive naturals, for example, 11230 + ... + 12751.

It is an arithmetic number, because the mean of its divisors is an integer number (4568571).

Almost surely, 2^18249541 is an apocalyptic number.

It is an amenable number.

18249541 is a deficient number, since it is larger than the sum of its proper divisors (24743).

18249541 is an equidigital number, since it uses as much as digits as its factorization.

18249541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24742.

The product of its digits is 11520, while the sum is 34.

The square root of 18249541 is about 4271.9481504344. The cubic root of 18249541 is about 263.2796641503.

The spelling of 18249541 in words is "eighteen million, two hundred forty-nine thousand, five hundred forty-one".