1000000009999 has 2 divisors, whose sum is σ = 1000000010000. Its totient is φ = 1000000009998.

The previous prime is 1000000009991. The next prime is 1000000010021. The reversal of 1000000009999 is 9999000000001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000000009999 - 2³ = 1000000009991 is a prime.

1000000009999 is a modest number, since divided by 9999 gives 1 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000000009991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500000004999 + 500000005000.

It is an arithmetic number, because the mean of its divisors is an integer number (500000005000).

Almost surely, 2^{1000000009999} is an apocalyptic number.

1000000009999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000000009999 is an equidigital number, since it uses as much as digits as its factorization.

1000000009999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 37.

The spelling of 1000000009999 in words is "one trillion, nine thousand, nine hundred ninety-nine".