999090999 has 6 divisors (see below), whose sum is σ = 1443131456. Its totient is φ = 666060660.

The previous prime is 999090929. The next prime is 999091021.

999090999 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 999090999 - 2¹⁵ = 999058231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999090929) 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 in 5 ways as a sum of consecutive naturals, for example, 55505047 + ... + 55505064.

Almost surely, 2^999090999 is an apocalyptic number.

999090999 is a deficient number, since it is larger than the sum of its proper divisors (444040457).

999090999 is a wasteful number, since it uses less digits than its factorization.

999090999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111010117 (or 111010114 counting only the distinct ones).

The product of its (nonzero) digits is 4782969, while the sum is 63.

The square root of 999090999 is about 31608.4007662520. The cubic root of 999090999 is about 999.6969078111.

The spelling of 999090999 in words is "nine hundred ninety-nine million, ninety thousand, nine hundred ninety-nine".