8831521 has 4 divisors (see below), whose sum is σ = 8855572. Its totient is φ = 8807472.

The previous prime is 8831513. The next prime is 8831527. The reversal of 8831521 is 1251388.

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 4161600 + 4669921 = 2040^2 + 2161^2 .

It is a cyclic number.

It is not a de Polignac number, because 8831521 - 2³ = 8831513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8831521.

It is not an unprimeable number, because it can be changed into a prime (8831527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11466 + ... + 12211.

It is an arithmetic number, because the mean of its divisors is an integer number (2213893).

Almost surely, 2^8831521 is an apocalyptic number.

It is an amenable number.

8831521 is a deficient number, since it is larger than the sum of its proper divisors (24051).

8831521 is a wasteful number, since it uses less digits than its factorization.

8831521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24050.

The product of its digits is 1920, while the sum is 28.

The square root of 8831521 is about 2971.7875092274. The cubic root of 8831521 is about 206.7022331550.

The spelling of 8831521 in words is "eight million, eight hundred thirty-one thousand, five hundred twenty-one".