8532721 has 4 divisors (see below), whose sum is σ = 8554612. Its totient is φ = 8510832.

The previous prime is 8532707. The next prime is 8532737. The reversal of 8532721 is 1272358.

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 2958400 + 5574321 = 1720^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 8532721 - 2⁷ = 8532593 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 8532721.

It is not an unprimeable number, because it can be changed into a prime (8532761) 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, 10350 + ... + 11143.

It is an arithmetic number, because the mean of its divisors is an integer number (2138653).

Almost surely, 2^8532721 is an apocalyptic number.

It is an amenable number.

8532721 is a deficient number, since it is larger than the sum of its proper divisors (21891).

8532721 is a wasteful number, since it uses less digits than its factorization.

8532721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21890.

The product of its digits is 3360, while the sum is 28.

The square root of 8532721 is about 2921.0821624870. The cubic root of 8532721 is about 204.3442939713.

The spelling of 8532721 in words is "eight million, five hundred thirty-two thousand, seven hundred twenty-one".