8333681521 has 27 divisors (see below), whose sum is σ = 9426986667. Its totient is φ = 7361544960.

The previous prime is 8333681513. The next prime is 8333681527. The reversal of 8333681521 is 1251863338.

The square root of 8333681521 is 91289.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2019154225 + 6314527296 = 44935^2 + 79464^2 .

It is not a de Polignac number, because 8333681521 - 2³ = 8333681513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8333681527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 43179601 + ... + 43179793.

Almost surely, 2^8333681521 is an apocalyptic number.

8333681521 is the 91289-th square number.

8333681521 is the 45645-th centered octagonal number.

It is an amenable number.

8333681521 is a deficient number, since it is larger than the sum of its proper divisors (1093305146).

8333681521 is an equidigital number, since it uses as much as digits as its factorization.

8333681521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 247 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The cubic root of 8333681521 is about 2027.4289014342.

The spelling of 8333681521 in words is "eight billion, three hundred thirty-three million, six hundred eighty-one thousand, five hundred twenty-one".