1000009999 has 2 divisors, whose sum is σ = 1000010000. Its totient is φ = 1000009998.

The previous prime is 1000009961. The next prime is 1000010029. The reversal of 1000009999 is 9999000001.

It is a strong prime.

It is an emirp because it is prime and its reverse (9999000001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000009999 - 2⁹ = 1000009487 is a prime.

1000009999 is a modest number, since divided by 9999 gives 10 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000009099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500004999 + 500005000.

It is an arithmetic number, because the mean of its divisors is an integer number (500005000).

Almost surely, 2^1000009999 is an apocalyptic number.

1000009999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000009999 is an equidigital number, since it uses as much as digits as its factorization.

1000009999 is an evil number, because the sum of its binary digits is even.

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

The square root of 1000009999 is about 31622.9346993602. The cubic root of 1000009999 is about 1000.0033329889.

The spelling of 1000009999 in words is "one billion, nine thousand, nine hundred ninety-nine".