9072168521 has 4 divisors (see below), whose sum is σ = 9770027652. Its totient is φ = 8374309392.

The previous prime is 9072168517. The next prime is 9072168527. The reversal of 9072168521 is 1258612709.

9072168521 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 3377353225 + 5694815296 = 58115^2 + 75464^2 .

It is a cyclic number.

It is not a de Polignac number, because 9072168521 - 2² = 9072168517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9072168527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 348929546 + ... + 348929571.

It is an arithmetic number, because the mean of its divisors is an integer number (2442506913).

Almost surely, 2^9072168521 is an apocalyptic number.

It is an amenable number.

9072168521 is a deficient number, since it is larger than the sum of its proper divisors (697859131).

9072168521 is a wasteful number, since it uses less digits than its factorization.

9072168521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697859130.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 9072168521 is about 95247.9318463136. The cubic root of 9072168521 is about 2085.6289009499.

The spelling of 9072168521 in words is "nine billion, seventy-two million, one hundred sixty-eight thousand, five hundred twenty-one".