312791 has 4 divisors (see below), whose sum is σ = 314832. Its totient is φ = 310752.

The previous prime is 312779. The next prime is 312799. The reversal of 312791 is 197213.

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 312791 - 2⁶ = 312727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 312791.

It is not an unprimeable number, because it can be changed into a prime (312799) 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, 770 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (78708).

2³¹²⁷⁹¹ is an apocalyptic number.

312791 is a deficient number, since it is larger than the sum of its proper divisors (2041).

312791 is a wasteful number, since it uses less digits than its factorization.

312791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

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

The square root of 312791 is about 559.2772121229. The cubic root of 312791 is about 67.8814977607.

The spelling of 312791 in words is "three hundred twelve thousand, seven hundred ninety-one".