9881689 has 2 divisors, whose sum is σ = 9881690. Its totient is φ = 9881688.

The previous prime is 9881687. The next prime is 9881693. The reversal of 9881689 is 9861889.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6801664 + 3080025 = 2608^2 + 1755^2 .

It is a cyclic number.

It is not a de Polignac number, because 9881689 - 2¹ = 9881687 is a prime.

Together with 9881687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9881687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4940844 + 4940845.

It is an arithmetic number, because the mean of its divisors is an integer number (4940845).

Almost surely, 2^9881689 is an apocalyptic number.

It is an amenable number.

9881689 is a deficient number, since it is larger than the sum of its proper divisors (1).

9881689 is an equidigital number, since it uses as much as digits as its factorization.

9881689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 49.

The square root of 9881689 is about 3143.5153888601. The cubic root of 9881689 is about 214.5904516527.

The spelling of 9881689 in words is "nine million, eight hundred eighty-one thousand, six hundred eighty-nine".