9813889 has 2 divisors, whose sum is σ = 9813890. Its totient is φ = 9813888.

The previous prime is 9813877. The next prime is 9813907. The reversal of 9813889 is 9883189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7333264 + 2480625 = 2708^2 + 1575^2 .

It is an emirp because it is prime and its reverse (9883189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9813889 - 2¹⁷ = 9682817 is a prime.

9813889 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9813829) 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, 4906944 + 4906945.

It is an arithmetic number, because the mean of its divisors is an integer number (4906945).

Almost surely, 2^9813889 is an apocalyptic number.

It is an amenable number.

9813889 is a deficient number, since it is larger than the sum of its proper divisors (1).

9813889 is an equidigital number, since it uses as much as digits as its factorization.

9813889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 46.

The square root of 9813889 is about 3132.7127222265. The cubic root of 9813889 is about 214.0985440113.

The spelling of 9813889 in words is "nine million, eight hundred thirteen thousand, eight hundred eighty-nine".