191109103 has 4 divisors (see below), whose sum is σ = 192800448. Its totient is φ = 189417760.

The previous prime is 191109091. The next prime is 191109119. The reversal of 191109103 is 301901191.

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 191109103 - 2¹⁷ = 190978031 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 (191109133) 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, 845503 + ... + 845728.

It is an arithmetic number, because the mean of its divisors is an integer number (48200112).

Almost surely, 2^191109103 is an apocalyptic number.

191109103 is a deficient number, since it is larger than the sum of its proper divisors (1691345).

191109103 is a wasteful number, since it uses less digits than its factorization.

191109103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1691344.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 191109103 is about 13824.2216055733. The cubic root of 191109103 is about 576.0061556939.

The spelling of 191109103 in words is "one hundred ninety-one million, one hundred nine thousand, one hundred three".