8943521 has 6 divisors (see below), whose sum is σ = 9072630. Its totient is φ = 8815136.

The previous prime is 8943463. The next prime is 8943523. The reversal of 8943521 is 1253498.

It can be written as a sum of positive squares in 3 ways, for example, as 883600 + 8059921 = 940^2 + 2839^2 .

It is not a de Polignac number, because 8943521 - 2⁶ = 8943457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8943523) 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 5 ways as a sum of consecutive naturals, for example, 28055 + ... + 28371.

It is an arithmetic number, because the mean of its divisors is an integer number (1512105).

Almost surely, 2^8943521 is an apocalyptic number.

It is an amenable number.

8943521 is a deficient number, since it is larger than the sum of its proper divisors (129109).

8943521 is an frugal number, since it uses more digits than its factorization.

8943521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723 (or 406 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 8943521 is about 2990.5720188619. The cubic root of 8943521 is about 207.5723539229.

The spelling of 8943521 in words is "eight million, nine hundred forty-three thousand, five hundred twenty-one".