9881 has 4 divisors (see below), whose sum is σ = 10164. Its totient is φ = 9600.
The previous prime is 9871. The next prime is 9883. The reversal of 9881 is 1889.
9881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 3481 + 6400 = 59^2 + 80^2 .
It is a cyclic number.
It is not a de Polignac number, because 9881 - 26 = 9817 is a prime.
It is a super-2 number, since 2×98812 = 195268322, which contains 22 as substring.
It is a Duffinian number.
It is a Curzon number.
It is a plaindrome in base 3, base 9 and base 16.
It is a nialpdrome in base 10.
It is a zygodrome in base 3.
It is a self number, because there is not a number n which added to its sum of digits gives 9881.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 9881.
It is not an unprimeable number, because it can be changed into a prime (9883) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80 + ... + 161.
It is an arithmetic number, because the mean of its divisors is an integer number (2541).
29881 is an apocalyptic number.
It is an amenable number.
9881 is a deficient number, since it is larger than the sum of its proper divisors (283).
9881 is a wasteful number, since it uses less digits than its factorization.
9881 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 282.
The product of its digits is 576, while the sum is 26.
The square root of 9881 is about 99.4032192638. The cubic root of 9881 is about 21.4585464103.
It can be divided in two parts, 988 and 1, that added together give a palindrome (989).
The spelling of 9881 in words is "nine thousand, eight hundred eighty-one".
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