8772521 has 4 divisors (see below), whose sum is σ = 8836692. Its totient is φ = 8708352.

The previous prime is 8772481. The next prime is 8772523. The reversal of 8772521 is 1252778.

8772521 = 24² + 25² + ... + 297².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1252778 = 2 ⋅626389.

It can be written as a sum of positive squares in 2 ways, for example, as 7182400 + 1590121 = 2680^2 + 1261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8772521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8772523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31880 + ... + 32153.

It is an arithmetic number, because the mean of its divisors is an integer number (2209173).

Almost surely, 2^8772521 is an apocalyptic number.

It is an amenable number.

8772521 is a deficient number, since it is larger than the sum of its proper divisors (64171).

8772521 is a wasteful number, since it uses less digits than its factorization.

8772521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64170.

The product of its digits is 7840, while the sum is 32.

The square root of 8772521 is about 2961.8441890147. The cubic root of 8772521 is about 206.2409048943.

The spelling of 8772521 in words is "eight million, seven hundred seventy-two thousand, five hundred twenty-one".