231316791 has 4 divisors (see below), whose sum is σ = 308422392. Its totient is φ = 154211192.

The previous prime is 231316783. The next prime is 231316801. The reversal of 231316791 is 197613132.

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 231316791 - 2³ = 231316783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231316741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38552796 + ... + 38552801.

It is an arithmetic number, because the mean of its divisors is an integer number (77105598).

Almost surely, 2^231316791 is an apocalyptic number.

231316791 is a deficient number, since it is larger than the sum of its proper divisors (77105601).

231316791 is an equidigital number, since it uses as much as digits as its factorization.

231316791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77105600.

The product of its digits is 6804, while the sum is 33.

The square root of 231316791 is about 15209.1022417498. The cubic root of 231316791 is about 613.8596012456.

The spelling of 231316791 in words is "two hundred thirty-one million, three hundred sixteen thousand, seven hundred ninety-one".