291317 has 4 divisors (see below), whose sum is σ = 313740. Its totient is φ = 268896.

The previous prime is 291299. The next prime is 291331. The reversal of 291317 is 713192.

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

It can be written as a sum of positive squares in 2 ways, for example, as 98596 + 192721 = 314^2 + 439^2 .

It is a cyclic number.

It is not a de Polignac number, because 291317 - 2⁶ = 291253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 291292 and 291301.

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 291317.

It is not an unprimeable number, because it can be changed into a prime (291337) 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, 11192 + ... + 11217.

It is an arithmetic number, because the mean of its divisors is an integer number (78435).

2²⁹¹³¹⁷ is an apocalyptic number.

It is an amenable number.

291317 is a deficient number, since it is larger than the sum of its proper divisors (22423).

291317 is a wasteful number, since it uses less digits than its factorization.

291317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22422.

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

The square root of 291317 is about 539.7378993549. The cubic root of 291317 is about 66.2911077497.

Subtracting 291317 from its reverse (713192), we obtain a cube (421875 = 75³).

It can be divided in two parts, 2 and 91317, that added together give a palindrome (91319).

The spelling of 291317 in words is "two hundred ninety-one thousand, three hundred seventeen".