9981869 has 2 divisors, whose sum is σ = 9981870. Its totient is φ = 9981868.

The previous prime is 9981863. The next prime is 9981889. The reversal of 9981869 is 9681899.

9981869 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5466244 + 4515625 = 2338^2 + 2125^2 .

It is an emirp because it is prime and its reverse (9681899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9981869 is a prime.

It is a super-2 number, since 2×9981869² = 199275417466322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9981863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4990934 + 4990935.

It is an arithmetic number, because the mean of its divisors is an integer number (4990935).

Almost surely, 2^9981869 is an apocalyptic number.

It is an amenable number.

9981869 is a deficient number, since it is larger than the sum of its proper divisors (1).

9981869 is an equidigital number, since it uses as much as digits as its factorization.

9981869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 50.

The square root of 9981869 is about 3159.4095967443. The cubic root of 9981869 is about 215.3131833799.

The spelling of 9981869 in words is "nine million, nine hundred eighty-one thousand, eight hundred sixty-nine".