18482581 has 4 divisors (see below), whose sum is σ = 19904332. Its totient is φ = 17060832.

The previous prime is 18482549. The next prime is 18482617. The reversal of 18482581 is 18528481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18528481 = 47 ⋅394223.

It can be written as a sum of positive squares in 2 ways, for example, as 10692900 + 7789681 = 3270^2 + 2791^2 .

It is a cyclic number.

It is not a de Polignac number, because 18482581 - 2⁵ = 18482549 is a prime.

It is a super-2 number, since 2×18482581² = 683211600843122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18482581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18482881) 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, 710856 + ... + 710881.

It is an arithmetic number, because the mean of its divisors is an integer number (4976083).

Almost surely, 2^18482581 is an apocalyptic number.

It is an amenable number.

18482581 is a deficient number, since it is larger than the sum of its proper divisors (1421751).

18482581 is a wasteful number, since it uses less digits than its factorization.

18482581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421750.

The product of its digits is 20480, while the sum is 37.

The square root of 18482581 is about 4299.1372390283. The cubic root of 18482581 is about 264.3955894037.

The spelling of 18482581 in words is "eighteen million, four hundred eighty-two thousand, five hundred eighty-one".