12191379 has 4 divisors (see below), whose sum is σ = 16255176. Its totient is φ = 8127584.

The previous prime is 12191371. The next prime is 12191381. The reversal of 12191379 is 97319121.

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 12191379 - 2³ = 12191371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12191371) 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 3 ways as a sum of consecutive naturals, for example, 2031894 + ... + 2031899.

It is an arithmetic number, because the mean of its divisors is an integer number (4063794).

Almost surely, 2^12191379 is an apocalyptic number.

12191379 is a deficient number, since it is larger than the sum of its proper divisors (4063797).

12191379 is an equidigital number, since it uses as much as digits as its factorization.

12191379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4063796.

The product of its digits is 3402, while the sum is 33.

The square root of 12191379 is about 3491.6155286629. The cubic root of 12191379 is about 230.1535144006.

The spelling of 12191379 in words is "twelve million, one hundred ninety-one thousand, three hundred seventy-nine".