9981881899 has 4 divisors (see below), whose sum is σ = 10889325720. Its totient is φ = 9074438080.

The previous prime is 9981881893. The next prime is 9981881909.

9981881899 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9981881899 - 2⁹ = 9981881387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9981881893) 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, 453721894 + ... + 453721915.

It is an arithmetic number, because the mean of its divisors is an integer number (2722331430).

Almost surely, 2^9981881899 is an apocalyptic number.

9981881899 is a deficient number, since it is larger than the sum of its proper divisors (907443821).

9981881899 is a wasteful number, since it uses less digits than its factorization.

9981881899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907443820.

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

The square root of 9981881899 is about 99909.3684245877. The cubic root of 9981881899 is about 2153.1327612554.

The spelling of 9981881899 in words is "nine billion, nine hundred eighty-one million, eight hundred eighty-one thousand, eight hundred ninety-nine".