996989791 has 16 divisors (see below), whose sum is σ = 1177417728. Its totient is φ = 826120800.

The previous prime is 996989783. The next prime is 996989797. The reversal of 996989791 is 197989699.

It is a cyclic number.

It is not a de Polignac number, because 996989791 - 2³ = 996989783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996989797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276621 + ... + 280201.

It is an arithmetic number, because the mean of its divisors is an integer number (73588608).

Almost surely, 2^996989791 is an apocalyptic number.

996989791 is a deficient number, since it is larger than the sum of its proper divisors (180427937).

996989791 is a wasteful number, since it uses less digits than its factorization.

996989791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4902.

The product of its digits is 19840464, while the sum is 67.

The square root of 996989791 is about 31575.1451461430. The cubic root of 996989791 is about 998.9955884953.

The spelling of 996989791 in words is "nine hundred ninety-six million, nine hundred eighty-nine thousand, seven hundred ninety-one".