5518821 has 24 divisors (see below), whose sum is σ = 9340704. Its totient is φ = 2866080.

The previous prime is 5518819. The next prime is 5518831. The reversal of 5518821 is 1288155.

It is not a de Polignac number, because 5518821 - 2¹ = 5518819 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5518831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90 + ... + 3323.

It is an arithmetic number, because the mean of its divisors is an integer number (389196).

Almost surely, 2^5518821 is an apocalyptic number.

It is an amenable number.

5518821 is a deficient number, since it is larger than the sum of its proper divisors (3821883).

5518821 is a wasteful number, since it uses less digits than its factorization.

5518821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3441 (or 3434 counting only the distinct ones).

The product of its digits is 3200, while the sum is 30.

The square root of 5518821 is about 2349.2171036326. The cubic root of 5518821 is about 176.7185350649.

The spelling of 5518821 in words is "five million, five hundred eighteen thousand, eight hundred twenty-one".