6611521 has 12 divisors (see below), whose sum is σ = 8144388. Its totient is φ = 5332992.

The previous prime is 6611519. The next prime is 6611533. The reversal of 6611521 is 1251166.

6611521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6071296 + 540225 = 2464^2 + 735^2 .

It is not a de Polignac number, because 6611521 - 2¹ = 6611519 is a prime.

6611521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6611492 and 6611501.

It is not an unprimeable number, because it can be changed into a prime (6611321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3136 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (678699).

Almost surely, 2^6611521 is an apocalyptic number.

It is an amenable number.

6611521 is a deficient number, since it is larger than the sum of its proper divisors (1532867).

6611521 is a wasteful number, since it uses less digits than its factorization.

6611521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7968 (or 7961 counting only the distinct ones).

The product of its digits is 360, while the sum is 22.

The square root of 6611521 is about 2571.2878096394. The cubic root of 6611521 is about 187.6868277063.

Adding to 6611521 its reverse (1251166), we get a palindrome (7862687).

The spelling of 6611521 in words is "six million, six hundred eleven thousand, five hundred twenty-one".