231791 has 4 divisors (see below), whose sum is σ = 264912. Its totient is φ = 198672.

The previous prime is 231779. The next prime is 231799. The reversal of 231791 is 197132.

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

It is a cyclic number.

It is not a de Polignac number, because 231791 - 2¹⁰ = 230767 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 (231799) 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 3 ways as a sum of consecutive naturals, for example, 16550 + ... + 16563.

It is an arithmetic number, because the mean of its divisors is an integer number (66228).

2²³¹⁷⁹¹ is an apocalyptic number.

231791 is a deficient number, since it is larger than the sum of its proper divisors (33121).

231791 is an equidigital number, since it uses as much as digits as its factorization.

231791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33120.

The product of its digits is 378, while the sum is 23.

The square root of 231791 is about 481.4467779516. The cubic root of 231791 is about 61.4278794122.

The spelling of 231791 in words is "two hundred thirty-one thousand, seven hundred ninety-one".