12191118 has 16 divisors (see below), whose sum is σ = 24599376. Its totient is φ = 4027520.

The previous prime is 12191117. The next prime is 12191129. The reversal of 12191118 is 81119121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12191117) 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 7 ways as a sum of consecutive naturals, for example, 8313 + ... + 9668.

It is an arithmetic number, because the mean of its divisors is an integer number (1537461).

Almost surely, 2^12191118 is an apocalyptic number.

12191118 is an abundant number, since it is smaller than the sum of its proper divisors (12408258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12191118 is a wasteful number, since it uses less digits than its factorization.

12191118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18099.

The product of its digits is 144, while the sum is 24.

The square root of 12191118 is about 3491.5781532138. The cubic root of 12191118 is about 230.1518719696.

The spelling of 12191118 in words is "twelve million, one hundred ninety-one thousand, one hundred eighteen".