12194271991 has 8 divisors (see below), whose sum is σ = 14002992000. Its totient is φ = 10502243640.

The previous prime is 12194271913. The next prime is 12194272001. The reversal of 12194271991 is 19917249121.

It is a happy number.

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 12194271991 - 2⁷ = 12194271863 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 (12194271911) 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, 29172691 + ... + 29173108.

It is an arithmetic number, because the mean of its divisors is an integer number (1750374000).

Almost surely, 2^12194271991 is an apocalyptic number.

12194271991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12194271991 is a deficient number, since it is larger than the sum of its proper divisors (1808720009).

12194271991 is a wasteful number, since it uses less digits than its factorization.

12194271991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58345829.

The product of its digits is 81648, while the sum is 46.

The spelling of 12194271991 in words is "twelve billion, one hundred ninety-four million, two hundred seventy-one thousand, nine hundred ninety-one".