9999999791 has 16 divisors (see below), whose sum is σ = 10626249600. Its totient is φ = 9394898688.

The previous prime is 9999999787. The next prime is 9999999817. The reversal of 9999999791 is 1979999999.

9999999791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9999999791 - 2² = 9999999787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999999701) 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 15 ways as a sum of consecutive naturals, for example, 214595 + ... + 257003.

It is an arithmetic number, because the mean of its divisors is an integer number (664140600).

Almost surely, 2^9999999791 is an apocalyptic number.

9999999791 is a deficient number, since it is larger than the sum of its proper divisors (626249809).

9999999791 is a wasteful number, since it uses less digits than its factorization.

9999999791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42658.

The product of its digits is 301327047, while the sum is 80.

The square root of 9999999791 is about 99999.9989550000. The cubic root of 9999999791 is about 2154.4346750227.

The spelling of 9999999791 in words is "nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, seven hundred ninety-one".