999991127906 has 8 divisors (see below), whose sum is σ = 1508366506320. Its totient is φ = 497202292468.

The previous prime is 999991127851. The next prime is 999991127963. The reversal of 999991127906 is 609721199999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 999991127906.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1396635296 + ... + 1396636011.

It is an arithmetic number, because the mean of its divisors is an integer number (188545813290).

Almost surely, 2^999991127906 is an apocalyptic number.

999991127906 is a deficient number, since it is larger than the sum of its proper divisors (508375378414).

999991127906 is a wasteful number, since it uses less digits than its factorization.

999991127906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793271488.

The product of its (nonzero) digits is 44641044, while the sum is 71.

The spelling of 999991127906 in words is "nine hundred ninety-nine billion, nine hundred ninety-one million, one hundred twenty-seven thousand, nine hundred six".