9881991889 has 16 divisors (see below), whose sum is σ = 12745249920. Its totient is φ = 7434725760.

The previous prime is 9881991877. The next prime is 9881991893.

9881991889 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9881991889 - 2¹⁷ = 9881860817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9881991839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2210484 + ... + 2214949.

It is an arithmetic number, because the mean of its divisors is an integer number (796578120).

Almost surely, 2^9881991889 is an apocalyptic number.

It is an amenable number.

9881991889 is a deficient number, since it is larger than the sum of its proper divisors (2863258031).

9881991889 is a wasteful number, since it uses less digits than its factorization.

9881991889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4425480.

The product of its digits is 26873856, while the sum is 70.

The square root of 9881991889 is about 99408.2083582639. The cubic root of 9881991889 is about 2145.9264413969.

The spelling of 9881991889 in words is "nine billion, eight hundred eighty-one million, nine hundred ninety-one thousand, eight hundred eighty-nine".