999944999 has 2 divisors, whose sum is σ = 999945000. Its totient is φ = 999944998.

The previous prime is 999944989. The next prime is 999945007. The reversal of 999944999 is 999449999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999944999 - 2⁴ = 999944983 is a prime.

It is a super-2 number, since 2×999944999² = 1999780002050220002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999944989) 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, 499972499 + 499972500.

It is an arithmetic number, because the mean of its divisors is an integer number (499972500).

Almost surely, 2^999944999 is an apocalyptic number.

999944999 is a deficient number, since it is larger than the sum of its proper divisors (1).

999944999 is an equidigital number, since it uses as much as digits as its factorization.

999944999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76527504, while the sum is 71.

The square root of 999944999 is about 31621.9069475577. The cubic root of 999944999 is about 999.9816659972.

The spelling of 999944999 in words is "nine hundred ninety-nine million, nine hundred forty-four thousand, nine hundred ninety-nine".