191145 has 8 divisors (see below), whose sum is σ = 305856. Its totient is φ = 101936.

The previous prime is 191143. The next prime is 191161. The reversal of 191145 is 541191.

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 191145 - 2¹ = 191143 is a prime.

It is a super-2 number, since 2×191145² = 73072822050, which contains 22 as substring.

191145 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (191141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6357 + ... + 6386.

It is an arithmetic number, because the mean of its divisors is an integer number (38232).

2¹⁹¹¹⁴⁵ is an apocalyptic number.

191145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

191145 is a deficient number, since it is larger than the sum of its proper divisors (114711).

191145 is a wasteful number, since it uses less digits than its factorization.

191145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12751.

The product of its digits is 180, while the sum is 21.

The square root of 191145 is about 437.2013266220. The cubic root of 191145 is about 57.6042218163.

The spelling of 191145 in words is "one hundred ninety-one thousand, one hundred forty-five".