8633521 has 4 divisors (see below), whose sum is σ = 9297652. Its totient is φ = 7969392.

The previous prime is 8633489. The next prime is 8633551. The reversal of 8633521 is 1253368.

8633521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 5588496 + 3045025 = 2364^2 + 1745^2 .

It is a cyclic number.

It is not a de Polignac number, because 8633521 - 2⁵ = 8633489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8633521.

It is not an unprimeable number, because it can be changed into a prime (8633551) 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, 332046 + ... + 332071.

It is an arithmetic number, because the mean of its divisors is an integer number (2324413).

Almost surely, 2^8633521 is an apocalyptic number.

It is an amenable number.

8633521 is a deficient number, since it is larger than the sum of its proper divisors (664131).

8633521 is a wasteful number, since it uses less digits than its factorization.

8633521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664130.

The product of its digits is 4320, while the sum is 28.

The square root of 8633521 is about 2938.2853843696. The cubic root of 8633521 is about 205.1458094132.

Adding to 8633521 its reverse (1253368), we get a palindrome (9886889).

The spelling of 8633521 in words is "eight million, six hundred thirty-three thousand, five hundred twenty-one".