18446521 has 4 divisors (see below), whose sum is σ = 18497152. Its totient is φ = 18395892.

The previous prime is 18446453. The next prime is 18446531. The reversal of 18446521 is 12564481.

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 18446521 - 2²³ = 10057913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18446531) 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, 24765 + ... + 25498.

It is an arithmetic number, because the mean of its divisors is an integer number (4624288).

Almost surely, 2^18446521 is an apocalyptic number.

It is an amenable number.

18446521 is a deficient number, since it is larger than the sum of its proper divisors (50631).

18446521 is an equidigital number, since it uses as much as digits as its factorization.

18446521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50630.

The product of its digits is 7680, while the sum is 31.

The square root of 18446521 is about 4294.9413267238. The cubic root of 18446521 is about 264.2235298825.

The spelling of 18446521 in words is "eighteen million, four hundred forty-six thousand, five hundred twenty-one".