9999991012 has 24 divisors (see below), whose sum is σ = 19279919232. Its totient is φ = 4500444000.

The previous prime is 9999990983. The next prime is 9999991031. The reversal of 9999991012 is 2101999999.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1120668 + ... + 1129555.

It is an arithmetic number, because the mean of its divisors is an integer number (803329968).

Almost surely, 2^9999991012 is an apocalyptic number.

It is an amenable number.

9999991012 is a deficient number, since it is larger than the sum of its proper divisors (9279928220).

9999991012 is a wasteful number, since it uses less digits than its factorization.

9999991012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2250339 (or 2250337 counting only the distinct ones).

The product of its (nonzero) digits is 1062882, while the sum is 58.

The square root of 9999991012 is about 99999.9550599899. The cubic root of 9999991012 is about 2154.4340445631.

The spelling of 9999991012 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-one thousand, twelve".