12195779 has 2 divisors, whose sum is σ = 12195780. Its totient is φ = 12195778.

The previous prime is 12195767. The next prime is 12195787. The reversal of 12195779 is 97759121.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (97759121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12195779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12195719) by changing a digit.

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 as a sum of consecutive naturals, namely, 6097889 + 6097890.

It is an arithmetic number, because the mean of its divisors is an integer number (6097890).

Almost surely, 2^12195779 is an apocalyptic number.

12195779 is a deficient number, since it is larger than the sum of its proper divisors (1).

12195779 is an equidigital number, since it uses as much as digits as its factorization.

12195779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 41.

The square root of 12195779 is about 3492.2455526495. The cubic root of 12195779 is about 230.1811993644.

The spelling of 12195779 in words is "twelve million, one hundred ninety-five thousand, seven hundred seventy-nine".