191317 has 8 divisors (see below), whose sum is σ = 221312. Its totient is φ = 162000.

The previous prime is 191299. The next prime is 191339. The reversal of 191317 is 713191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191317 - 2⁷ = 191189 is a prime.

191317 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191717) 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 7 ways as a sum of consecutive naturals, for example, 967 + ... + 1147.

It is an arithmetic number, because the mean of its divisors is an integer number (27664).

2¹⁹¹³¹⁷ is an apocalyptic number.

It is an amenable number.

191317 is a deficient number, since it is larger than the sum of its proper divisors (29995).

191317 is a wasteful number, since it uses less digits than its factorization.

191317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339.

The product of its digits is 189, while the sum is 22.

The square root of 191317 is about 437.3979881069. The cubic root of 191317 is about 57.6214948390.

The spelling of 191317 in words is "one hundred ninety-one thousand, three hundred seventeen".