8043521 has 4 divisors (see below), whose sum is σ = 8175444. Its totient is φ = 7911600.

The previous prime is 8043487. The next prime is 8043557. The reversal of 8043521 is 1253408.

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 287296 + 7756225 = 536^2 + 2785^2 .

It is a cyclic number.

It is not a de Polignac number, because 8043521 - 2⁶ = 8043457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8043571) 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, 65870 + ... + 65991.

It is an arithmetic number, because the mean of its divisors is an integer number (2043861).

Almost surely, 2^8043521 is an apocalyptic number.

It is an amenable number.

8043521 is a deficient number, since it is larger than the sum of its proper divisors (131923).

8043521 is a wasteful number, since it uses less digits than its factorization.

8043521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131922.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 8043521 is about 2836.1101882684. The cubic root of 8043521 is about 200.3620193147.

Adding to 8043521 its reverse (1253408), we get a palindrome (9296929).

The spelling of 8043521 in words is "eight million, forty-three thousand, five hundred twenty-one".