9991438033 has 4 divisors (see below), whose sum is σ = 10579169700. Its totient is φ = 9403706368.

The previous prime is 9991438031. The next prime is 9991438103. The reversal of 9991438033 is 3308341999.

9991438033 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 3739689409 + 6251748624 = 61153^2 + 79068^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991438033 - 2¹ = 9991438031 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9991438031) 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, 293865808 + ... + 293865841.

It is an arithmetic number, because the mean of its divisors is an integer number (2644792425).

Almost surely, 2^9991438033 is an apocalyptic number.

It is an amenable number.

9991438033 is a deficient number, since it is larger than the sum of its proper divisors (587731667).

9991438033 is a wasteful number, since it uses less digits than its factorization.

9991438033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587731666.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 9991438033 is about 99957.1809976652. The cubic root of 9991438033 is about 2153.8196411735.

The spelling of 9991438033 in words is "nine billion, nine hundred ninety-one million, four hundred thirty-eight thousand, thirty-three".