12423919191 has 8 divisors (see below), whose sum is σ = 16566111744. Its totient is φ = 8282169720.

The previous prime is 12423919187. The next prime is 12423919217. The reversal of 12423919191 is 19191932421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12423919191 - 2² = 12423919187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12423919111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38631 + ... + 162296.

It is an arithmetic number, because the mean of its divisors is an integer number (2070763968).

Almost surely, 2^12423919191 is an apocalyptic number.

12423919191 is a deficient number, since it is larger than the sum of its proper divisors (4142192553).

12423919191 is a wasteful number, since it uses less digits than its factorization.

12423919191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221541.

The product of its digits is 34992, while the sum is 42.

The spelling of 12423919191 in words is "twelve billion, four hundred twenty-three million, nine hundred nineteen thousand, one hundred ninety-one".