9729085521 has 8 divisors (see below), whose sum is σ = 12984253120. Its totient is φ = 6479987472.

The previous prime is 9729085501. The next prime is 9729085543. The reversal of 9729085521 is 1255809279.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9729085521 - 2¹⁷ = 9728954449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9729085501) 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 7 ways as a sum of consecutive naturals, for example, 1513645 + ... + 1520058.

It is an arithmetic number, because the mean of its divisors is an integer number (1623031640).

Almost surely, 2^9729085521 is an apocalyptic number.

It is an amenable number.

9729085521 is a deficient number, since it is larger than the sum of its proper divisors (3255167599).

9729085521 is a wasteful number, since it uses less digits than its factorization.

9729085521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034775.

The product of its (nonzero) digits is 453600, while the sum is 48.

The square root of 9729085521 is about 98636.1268552248. The cubic root of 9729085521 is about 2134.8007186018.

The spelling of 9729085521 in words is "nine billion, seven hundred twenty-nine million, eighty-five thousand, five hundred twenty-one".