191317223 has 4 divisors (see below), whose sum is σ = 193739040. Its totient is φ = 188895408.

The previous prime is 191317199. The next prime is 191317229. The reversal of 191317223 is 322713191.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191317223 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 (191317229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210790 + ... + 1210947.

It is an arithmetic number, because the mean of its divisors is an integer number (48434760).

Almost surely, 2^191317223 is an apocalyptic number.

191317223 is a deficient number, since it is larger than the sum of its proper divisors (2421817).

191317223 is an equidigital number, since it uses as much as digits as its factorization.

191317223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421816.

The product of its digits is 2268, while the sum is 29.

The square root of 191317223 is about 13831.7469250995. The cubic root of 191317223 is about 576.2151722700.

The spelling of 191317223 in words is "one hundred ninety-one million, three hundred seventeen thousand, two hundred twenty-three".