791891 has 2 divisors, whose sum is σ = 791892. Its totient is φ = 791890.

The previous prime is 791887. The next prime is 791897. The reversal of 791891 is 198197.

It is a weak prime.

It is an emirp because it is prime and its reverse (198197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 791891 - 2² = 791887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (791897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395945 + 395946.

It is an arithmetic number, because the mean of its divisors is an integer number (395946).

2⁷⁹¹⁸⁹¹ is an apocalyptic number.

791891 is a deficient number, since it is larger than the sum of its proper divisors (1).

791891 is an equidigital number, since it uses as much as digits as its factorization.

791891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 35.

The square root of 791891 is about 889.8825765234. The cubic root of 791891 is about 92.5170555353.

The spelling of 791891 in words is "seven hundred ninety-one thousand, eight hundred ninety-one".