9981881898 has 16 divisors (see below), whose sum is σ = 19965024480. Its totient is φ = 3327083856.

The previous prime is 9981881893. The next prime is 9981881909. The reversal of 9981881898 is 8981881899.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9981881893) 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 7 ways as a sum of consecutive naturals, for example, 73761 + ... + 159387.

It is an arithmetic number, because the mean of its divisors is an integer number (1247814030).

Almost surely, 2^9981881898 is an apocalyptic number.

9981881898 is an abundant number, since it is smaller than the sum of its proper divisors (9983142582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9981881898 is a wasteful number, since it uses less digits than its factorization.

9981881898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105061.

The product of its digits is 23887872, while the sum is 69.

The square root of 9981881898 is about 99909.3684195832. The cubic root of 9981881898 is about 2153.1327611835.

Subtracting from 9981881898 its reverse (8981881899), we obtain a palindrome (999999999).

The spelling of 9981881898 in words is "nine billion, nine hundred eighty-one million, eight hundred eighty-one thousand, eight hundred ninety-eight".