9981331899 has 64 divisors (see below), whose sum is σ = 17389286400. Its totient is φ = 5044757760.

The previous prime is 9981331897. The next prime is 9981331909.

9981331899 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 9981331899 - 2¹ = 9981331897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9981331891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 406887 + ... + 430719.

It is an arithmetic number, because the mean of its divisors is an integer number (271707600).

Almost surely, 2^9981331899 is an apocalyptic number.

9981331899 is a deficient number, since it is larger than the sum of its proper divisors (7407954501).

9981331899 is a wasteful number, since it uses less digits than its factorization.

9981331899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23905 (or 23891 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 60.

The square root of 9981331899 is about 99906.6158920419. The cubic root of 9981331899 is about 2153.0932147790.

The spelling of 9981331899 in words is "nine billion, nine hundred eighty-one million, three hundred thirty-one thousand, eight hundred ninety-nine".