791991 has 8 divisors (see below), whose sum is σ = 1173360. Its totient is φ = 527976.

The previous prime is 791971. The next prime is 791993. The reversal of 791991 is 199197.

It is not a de Polignac number, because 791991 - 2⁶ = 791927 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (791993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14640 + ... + 14693.

It is an arithmetic number, because the mean of its divisors is an integer number (146670).

2⁷⁹¹⁹⁹¹ is an apocalyptic number.

791991 is a deficient number, since it is larger than the sum of its proper divisors (381369).

791991 is a wasteful number, since it uses less digits than its factorization.

791991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29342 (or 29336 counting only the distinct ones).

The product of its digits is 5103, while the sum is 36.

The square root of 791991 is about 889.9387619381. The cubic root of 791991 is about 92.5209497229.

The spelling of 791991 in words is "seven hundred ninety-one thousand, nine hundred ninety-one".