9816881 has 4 divisors (see below), whose sum is σ = 9841764. Its totient is φ = 9792000.

The previous prime is 9816847. The next prime is 9816889. The reversal of 9816881 is 1886189.

9816881 = 2215² + 2216².

9816881 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 4906225 + 4910656 = 2215^2 + 2216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9816881 is a prime.

It is a super-2 number, since 2×9816881² = 192742305136322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9816889) 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, 11840 + ... + 12641.

It is an arithmetic number, because the mean of its divisors is an integer number (2460441).

Almost surely, 2^9816881 is an apocalyptic number.

9816881 is the 2216-th centered square number.

It is an amenable number.

9816881 is a deficient number, since it is larger than the sum of its proper divisors (24883).

9816881 is a wasteful number, since it uses less digits than its factorization.

9816881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24882.

The product of its digits is 27648, while the sum is 41.

The square root of 9816881 is about 3133.1902272285. The cubic root of 9816881 is about 214.1202994967.

The spelling of 9816881 in words is "nine million, eight hundred sixteen thousand, eight hundred eighty-one".