191147 has 4 divisors (see below), whose sum is σ = 208536. Its totient is φ = 173760.

The previous prime is 191143. The next prime is 191161. The reversal of 191147 is 741191.

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

It is a cyclic number.

It is not a de Polignac number, because 191147 - 2² = 191143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191141) 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 3 ways as a sum of consecutive naturals, for example, 8678 + ... + 8699.

It is an arithmetic number, because the mean of its divisors is an integer number (52134).

2¹⁹¹¹⁴⁷ is an apocalyptic number.

191147 is a deficient number, since it is larger than the sum of its proper divisors (17389).

191147 is a wasteful number, since it uses less digits than its factorization.

191147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17388.

The product of its digits is 252, while the sum is 23.

The square root of 191147 is about 437.2036138917. The cubic root of 191147 is about 57.6044227250.

The spelling of 191147 in words is "one hundred ninety-one thousand, one hundred forty-seven".