191115 has 24 divisors (see below), whose sum is σ = 344448. Its totient is φ = 97920.

The previous prime is 191099. The next prime is 191119. The reversal of 191115 is 511191.

It is not a de Polignac number, because 191115 - 2⁴ = 191099 is a prime.

It is a super-3 number, since 3×191115³ = 20941393573337625, which contains 333 as substring.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an Ulam 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 23 ways as a sum of consecutive naturals, for example, 1327 + ... + 1463.

It is an arithmetic number, because the mean of its divisors is an integer number (14352).

2¹⁹¹¹¹⁵ is an apocalyptic number.

191115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

191115 is a deficient number, since it is larger than the sum of its proper divisors (153333).

191115 is a wasteful number, since it uses less digits than its factorization.

191115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 176 counting only the distinct ones).

The product of its digits is 45, while the sum is 18.

The square root of 191115 is about 437.1670161391. The cubic root of 191115 is about 57.6012080186.

The spelling of 191115 in words is "one hundred ninety-one thousand, one hundred fifteen".