18582521 has 4 divisors (see below), whose sum is σ = 18624912. Its totient is φ = 18540132.

The previous prime is 18582503. The next prime is 18582523. The reversal of 18582521 is 12528581.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18582521 - 2⁶ = 18582457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18582523) 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, 20531 + ... + 21416.

It is an arithmetic number, because the mean of its divisors is an integer number (4656228).

Almost surely, 2^18582521 is an apocalyptic number.

It is an amenable number.

18582521 is a deficient number, since it is larger than the sum of its proper divisors (42391).

18582521 is an equidigital number, since it uses as much as digits as its factorization.

18582521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42390.

The product of its digits is 6400, while the sum is 32.

The square root of 18582521 is about 4310.7448312328. The cubic root of 18582521 is about 264.8712843517.

The spelling of 18582521 in words is "eighteen million, five hundred eighty-two thousand, five hundred twenty-one".