998899709 has 2 divisors, whose sum is σ = 998899710. Its totient is φ = 998899708.

The previous prime is 998899703. The next prime is 998899739. The reversal of 998899709 is 907998899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 871548484 + 127351225 = 29522^2 + 11285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998899709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998899703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499449854 + 499449855.

It is an arithmetic number, because the mean of its divisors is an integer number (499449855).

Almost surely, 2^998899709 is an apocalyptic number.

It is an amenable number.

998899709 is a deficient number, since it is larger than the sum of its proper divisors (1).

998899709 is an equidigital number, since it uses as much as digits as its factorization.

998899709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26453952, while the sum is 68.

The square root of 998899709 is about 31605.3746853284. The cubic root of 998899709 is about 999.6331017355.

The spelling of 998899709 in words is "nine hundred ninety-eight million, eight hundred ninety-nine thousand, seven hundred nine".