999998000009 has 2 divisors, whose sum is σ = 999998000010. Its totient is φ = 999998000008.

The previous prime is 999997999981. The next prime is 999998000051. The reversal of 999998000009 is 900000899999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999994000009 + 4000000 = 999997^2 + 2000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999998000009 is a prime.

It is not a weakly prime, because it can be changed into another prime (999998003009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999000004 + 499999000005.

It is an arithmetic number, because the mean of its divisors is an integer number (499999000005).

Almost surely, 2^999998000009 is an apocalyptic number.

It is an amenable number.

999998000009 is a deficient number, since it is larger than the sum of its proper divisors (1).

999998000009 is an equidigital number, since it uses as much as digits as its factorization.

999998000009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4251528, while the sum is 62.

The spelling of 999998000009 in words is "nine hundred ninety-nine billion, nine hundred ninety-eight million, nine", and thus it is an aban number.