791 has 4 divisors (see below), whose sum is σ = 912. Its totient is φ = 672.

The previous prime is 787. The next prime is 797. The reversal of 791 is 197.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 791 - 2² = 787 is a prime.

It is a Duffinian number.

It is a plaindrome in base 6, base 12, base 13 and base 15.

It is a nialpdrome in base 7.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (797) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 63.

It is an arithmetic number, because the mean of its divisors is an integer number (228).

791 is a deficient number, since it is larger than the sum of its proper divisors (121).

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

791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120.

The product of its digits is 63, while the sum is 17.

The square root of 791 is about 28.1247222209. The cubic root of 791 is about 9.2482343842.

Adding to 791 its sum of digits (17), we get a palindrome (808).

The spelling of 791 in words is "seven hundred ninety-one", and thus it is an aban number.