12191995 has 4 divisors (see below), whose sum is σ = 14630400. Its totient is φ = 9753592.

The previous prime is 12191947. The next prime is 12192017. The reversal of 12191995 is 59919121.

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 12191995 - 2¹⁹ = 11667707 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219195 + ... + 1219204.

It is an arithmetic number, because the mean of its divisors is an integer number (3657600).

Almost surely, 2^12191995 is an apocalyptic number.

12191995 is a deficient number, since it is larger than the sum of its proper divisors (2438405).

12191995 is an equidigital number, since it uses as much as digits as its factorization.

12191995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438404.

The product of its digits is 7290, while the sum is 37.

The square root of 12191995 is about 3491.7037388645. The cubic root of 12191995 is about 230.1573906965.

The spelling of 12191995 in words is "twelve million, one hundred ninety-one thousand, nine hundred ninety-five".