9989509 has 2 divisors, whose sum is σ = 9989510. Its totient is φ = 9989508.

The previous prime is 9989503. The next prime is 9989569. The reversal of 9989509 is 9059899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6360484 + 3629025 = 2522^2 + 1905^2 .

It is an emirp because it is prime and its reverse (9059899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9989509 - 2⁵ = 9989477 is a prime.

It is a super-3 number, since 3×9989509³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9989503) 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, 4994754 + 4994755.

It is an arithmetic number, because the mean of its divisors is an integer number (4994755).

Almost surely, 2^9989509 is an apocalyptic number.

It is an amenable number.

9989509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9989509 is an equidigital number, since it uses as much as digits as its factorization.

9989509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 49.

The square root of 9989509 is about 3160.6184521388. The cubic root of 9989509 is about 215.3681020601.

The spelling of 9989509 in words is "nine million, nine hundred eighty-nine thousand, five hundred nine".