5518221 has 8 divisors (see below), whose sum is σ = 7368960. Its totient is φ = 3673152.

The previous prime is 5518171. The next prime is 5518241. The reversal of 5518221 is 1228155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5518221 - 2⁶ = 5518157 is a prime.

5518221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5518191 and 5518200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5518241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2116 + ... + 3938.

It is an arithmetic number, because the mean of its divisors is an integer number (921120).

Almost surely, 2^5518221 is an apocalyptic number.

It is an amenable number.

5518221 is a deficient number, since it is larger than the sum of its proper divisors (1850739).

5518221 is a wasteful number, since it uses less digits than its factorization.

5518221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835.

The product of its digits is 800, while the sum is 24.

The square root of 5518221 is about 2349.0893980434. The cubic root of 5518221 is about 176.7121306195.

The spelling of 5518221 in words is "five million, five hundred eighteen thousand, two hundred twenty-one".