999192099 has 32 divisors (see below), whose sum is σ = 1392035904. Its totient is φ = 637009920.

The previous prime is 999191959. The next prime is 999192107. The reversal of 999192099 is 990291999.

It is a Cunningham number, because it is equal to 31610²-1.

It is not a de Polignac number, because 999192099 - 2⁹ = 999191587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (999194099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2307387 + ... + 2307819.

It is an arithmetic number, because the mean of its divisors is an integer number (43501122).

Almost surely, 2^999192099 is an apocalyptic number.

999192099 is a deficient number, since it is larger than the sum of its proper divisors (392843805).

999192099 is a wasteful number, since it uses less digits than its factorization.

999192099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807.

The product of its (nonzero) digits is 1062882, while the sum is 57.

The square root of 999192099 is about 31609.9999841822. Note that the first 4 decimals coincide. The cubic root of 999192099 is about 999.7306271114.

The spelling of 999192099 in words is "nine hundred ninety-nine million, one hundred ninety-two thousand, ninety-nine".