996991899 has 64 divisors (see below), whose sum is σ = 1487216640. Its totient is φ = 592220160.

The previous prime is 996991861. The next prime is 996991901. The reversal of 996991899 is 998199699.

It is not a de Polignac number, because 996991899 - 2⁸ = 996991643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (996991819) 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 63 ways as a sum of consecutive naturals, for example, 9679482 + ... + 9679584.

It is an arithmetic number, because the mean of its divisors is an integer number (23237760).

Almost surely, 2^996991899 is an apocalyptic number.

996991899 is the 16878-th nonagonal number.

996991899 is a deficient number, since it is larger than the sum of its proper divisors (490224741).

996991899 is a wasteful number, since it uses less digits than its factorization.

996991899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300.

The product of its digits is 25509168, while the sum is 69.

The square root of 996991899 is about 31575.1785268112. The cubic root of 996991899 is about 998.9962925751.

The spelling of 996991899 in words is "nine hundred ninety-six million, nine hundred ninety-one thousand, eight hundred ninety-nine".