18554321 has 4 divisors (see below), whose sum is σ = 18689892. Its totient is φ = 18418752.

The previous prime is 18554311. The next prime is 18554323. The reversal of 18554321 is 12345581.

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 16289296 + 2265025 = 4036^2 + 1505^2 .

It is a cyclic number.

It is not a de Polignac number, because 18554321 - 2¹⁸ = 18292177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18554323) 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, 67580 + ... + 67853.

It is an arithmetic number, because the mean of its divisors is an integer number (4672473).

Almost surely, 2^18554321 is an apocalyptic number.

It is an amenable number.

18554321 is a deficient number, since it is larger than the sum of its proper divisors (135571).

18554321 is a wasteful number, since it uses less digits than its factorization.

18554321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135570.

The product of its digits is 4800, while the sum is 29.

The square root of 18554321 is about 4307.4726928908. The cubic root of 18554321 is about 264.7372309259.

The spelling of 18554321 in words is "eighteen million, five hundred fifty-four thousand, three hundred twenty-one".