4359991921 has 16 divisors (see below), whose sum is σ = 5027011200. Its totient is φ = 3753485568.

The previous prime is 4359991907. The next prime is 4359991939. The reversal of 4359991921 is 1291999534.

It is not a de Polignac number, because 4359991921 - 2²¹ = 4357894769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4359991981) 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 15 ways as a sum of consecutive naturals, for example, 223365 + ... + 242098.

It is an arithmetic number, because the mean of its divisors is an integer number (314188200).

Almost surely, 2^4359991921 is an apocalyptic number.

It is an amenable number.

4359991921 is a deficient number, since it is larger than the sum of its proper divisors (667019279).

4359991921 is a wasteful number, since it uses less digits than its factorization.

4359991921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465528.

The product of its digits is 787320, while the sum is 52.

The square root of 4359991921 is about 66030.2349003848. The cubic root of 4359991921 is about 1633.6608250117.

The spelling of 4359991921 in words is "four billion, three hundred fifty-nine million, nine hundred ninety-one thousand, nine hundred twenty-one".