9328913721 has 64 divisors (see below), whose sum is σ = 15115161600. Its totient is φ = 5666371200.

The previous prime is 9328913707. The next prime is 9328913729. The reversal of 9328913721 is 1273198239.

9328913721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9328913721 - 2²⁵ = 9295359289 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9328913729) 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 63 ways as a sum of consecutive naturals, for example, 1490220 + ... + 1496466.

It is an arithmetic number, because the mean of its divisors is an integer number (236174400).

Almost surely, 2^9328913721 is an apocalyptic number.

It is an amenable number.

9328913721 is a deficient number, since it is larger than the sum of its proper divisors (5786247879).

9328913721 is a wasteful number, since it uses less digits than its factorization.

9328913721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6387 (or 6381 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 9328913721 is about 96586.3019325204. The cubic root of 9328913721 is about 2105.1208150727.

The spelling of 9328913721 in words is "nine billion, three hundred twenty-eight million, nine hundred thirteen thousand, seven hundred twenty-one".