9888998881 has 2 divisors, whose sum is σ = 9888998882. Its totient is φ = 9888998880.

The previous prime is 9888998863. The next prime is 9888998887. The reversal of 9888998881 is 1888998889.

9888998881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9698310400 + 190688481 = 98480^2 + 13809^2 .

It is a cyclic number.

It is not a de Polignac number, because 9888998881 - 2⁹ = 9888998369 is a prime.

It is a super-2 number, since 2×9888998881² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9888998798 and 9888998807.

It is not a weakly prime, because it can be changed into another prime (9888998887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4944499440 + 4944499441.

It is an arithmetic number, because the mean of its divisors is an integer number (4944499441).

Almost surely, 2^9888998881 is an apocalyptic number.

It is an amenable number.

9888998881 is a deficient number, since it is larger than the sum of its proper divisors (1).

9888998881 is an equidigital number, since it uses as much as digits as its factorization.

9888998881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 191102976, while the sum is 76.

The square root of 9888998881 is about 99443.4456412287. The cubic root of 9888998881 is about 2146.4335232693.

The spelling of 9888998881 in words is "nine billion, eight hundred eighty-eight million, nine hundred ninety-eight thousand, eight hundred eighty-one".