9998909689 has 2 divisors, whose sum is σ = 9998909690. Its totient is φ = 9998909688.

The previous prime is 9998909659. The next prime is 9998909707. The reversal of 9998909689 is 9869098999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7760200464 + 2238709225 = 88092^2 + 47315^2 .

It is an emirp because it is prime and its reverse (9869098999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9998909689 - 2²⁹ = 9462038777 is a prime.

It is not a weakly prime, because it can be changed into another prime (9998909629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999454844 + 4999454845.

It is an arithmetic number, because the mean of its divisors is an integer number (4999454845).

Almost surely, 2^9998909689 is an apocalyptic number.

It is an amenable number.

9998909689 is a deficient number, since it is larger than the sum of its proper divisors (1).

9998909689 is an equidigital number, since it uses as much as digits as its factorization.

9998909689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204073344, while the sum is 76.

The square root of 9998909689 is about 99994.5482963946. The cubic root of 9998909689 is about 2154.3563870580.

The spelling of 9998909689 in words is "nine billion, nine hundred ninety-eight million, nine hundred nine thousand, six hundred eighty-nine".