6612521 has 4 divisors (see below), whose sum is σ = 6773844. Its totient is φ = 6451200.

The previous prime is 6612499. The next prime is 6612539. The reversal of 6612521 is 1252166.

6612521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 1155625 + 5456896 = 1075^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 6612521 - 2⁶ = 6612457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6612581) 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 3 ways as a sum of consecutive naturals, for example, 80600 + ... + 80681.

It is an arithmetic number, because the mean of its divisors is an integer number (1693461).

Almost surely, 2^6612521 is an apocalyptic number.

It is an amenable number.

6612521 is a deficient number, since it is larger than the sum of its proper divisors (161323).

6612521 is a wasteful number, since it uses less digits than its factorization.

6612521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161322.

The product of its digits is 720, while the sum is 23.

The square root of 6612521 is about 2571.4822573761. The cubic root of 6612521 is about 187.6962898440.

Adding to 6612521 its reverse (1252166), we get a palindrome (7864687).

The spelling of 6612521 in words is "six million, six hundred twelve thousand, five hundred twenty-one".