12209041775891 has 2 divisors, whose sum is σ = 12209041775892. Its totient is φ = 12209041775890.

The previous prime is 12209041775867. The next prime is 12209041775911. The reversal of 12209041775891 is 19857714090221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12209041775891 is a prime.

It is not a weakly prime, because it can be changed into another prime (12209041775191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6104520887945 + 6104520887946.

It is an arithmetic number, because the mean of its divisors is an integer number (6104520887946).

Almost surely, 2^{12209041775891} is an apocalyptic number.

12209041775891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12209041775891 is an equidigital number, since it uses as much as digits as its factorization.

12209041775891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 56.

The spelling of 12209041775891 in words is "twelve trillion, two hundred nine billion, forty-one million, seven hundred seventy-five thousand, eight hundred ninety-one".