9988609 has 2 divisors, whose sum is σ = 9988610. Its totient is φ = 9988608.

The previous prime is 9988607. The next prime is 9988633. The reversal of 9988609 is 9068899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9628609 + 360000 = 3103^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 9988609 - 2¹ = 9988607 is a prime.

Together with 9988607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9988607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994304 + 4994305.

It is an arithmetic number, because the mean of its divisors is an integer number (4994305).

Almost surely, 2^9988609 is an apocalyptic number.

It is an amenable number.

9988609 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988609 is an equidigital number, since it uses as much as digits as its factorization.

9988609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 9988609 is about 3160.4760717335. The cubic root of 9988609 is about 215.3616340374.

The spelling of 9988609 in words is "nine million, nine hundred eighty-eight thousand, six hundred nine".