5509521 has 6 divisors (see below), whose sum is σ = 7958210. Its totient is φ = 3673008.

The previous prime is 5509453. The next prime is 5509549. The reversal of 5509521 is 1259055.

5509521 is a `hidden beast` number, since 550 + 95 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4161600 + 1347921 = 2040^2 + 1161^2 .

It is not a de Polignac number, because 5509521 - 2⁷ = 5509393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5509561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 306076 + ... + 306093.

Almost surely, 2^5509521 is an apocalyptic number.

It is an amenable number.

5509521 is a deficient number, since it is larger than the sum of its proper divisors (2448689).

5509521 is a wasteful number, since it uses less digits than its factorization.

5509521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612175 (or 612172 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 27.

The square root of 5509521 is about 2347.2368862132. The cubic root of 5509521 is about 176.6192139473.

The spelling of 5509521 in words is "five million, five hundred nine thousand, five hundred twenty-one".