191093191 has 4 divisors (see below), whose sum is σ = 191213712. Its totient is φ = 190972672.

The previous prime is 191093173. The next prime is 191093219. The reversal of 191093191 is 191390191.

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-191093191 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 (191093101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57850 + ... + 61063.

It is an arithmetic number, because the mean of its divisors is an integer number (47803428).

Almost surely, 2^191093191 is an apocalyptic number.

191093191 is a deficient number, since it is larger than the sum of its proper divisors (120521).

191093191 is a wasteful number, since it uses less digits than its factorization.

191093191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120520.

The product of its (nonzero) digits is 2187, while the sum is 34.

The square root of 191093191 is about 13823.6460819858. The cubic root of 191093191 is about 575.9901689021.

The spelling of 191093191 in words is "one hundred ninety-one million, ninety-three thousand, one hundred ninety-one".