191117 has 4 divisors (see below), whose sum is σ = 192000. Its totient is φ = 190236.

The previous prime is 191099. The next prime is 191119. The reversal of 191117 is 711191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 191117 - 2¹⁰ = 190093 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 (191119) 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, 134 + ... + 632.

It is an arithmetic number, because the mean of its divisors is an integer number (48000).

2¹⁹¹¹¹⁷ is an apocalyptic number.

It is an amenable number.

191117 is a deficient number, since it is larger than the sum of its proper divisors (883).

191117 is an equidigital number, since it uses as much as digits as its factorization.

191117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882.

The product of its digits is 63, while the sum is 20.

The square root of 191117 is about 437.1693035884. The cubic root of 191117 is about 57.6014089483.

The spelling of 191117 in words is "one hundred ninety-one thousand, one hundred seventeen".