9988089989 has 4 divisors (see below), whose sum is σ = 10055124300. Its totient is φ = 9921055680.

The previous prime is 9988089971. The next prime is 9988089997. The reversal of 9988089989 is 9899808899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9899808899 = 8999 ⋅1100101.

It can be written as a sum of positive squares in 2 ways, for example, as 1237984225 + 8750105764 = 35185^2 + 93542^2 .

It is a cyclic number.

It is not a de Polignac number, because 9988089989 - 2²⁰ = 9987041413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988089589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33516932 + ... + 33517229.

It is an arithmetic number, because the mean of its divisors is an integer number (2513781075).

Almost surely, 2^9988089989 is an apocalyptic number.

It is an amenable number.

9988089989 is a deficient number, since it is larger than the sum of its proper divisors (67034311).

9988089989 is a wasteful number, since it uses less digits than its factorization.

9988089989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67034310.

The product of its (nonzero) digits is 241864704, while the sum is 77.

The square root of 9988089989 is about 99940.4322033880. The cubic root of 9988089989 is about 2153.5790388862.

The spelling of 9988089989 in words is "nine billion, nine hundred eighty-eight million, eighty-nine thousand, nine hundred eighty-nine".