12191560091 has 2 divisors, whose sum is σ = 12191560092. Its totient is φ = 12191560090.

The previous prime is 12191560063. The next prime is 12191560097. The reversal of 12191560091 is 19006519121.

It is a strong prime.

It is an emirp because it is prime and its reverse (19006519121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12191560091 - 2¹⁸ = 12191297947 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12191560097) 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 as a sum of consecutive naturals, namely, 6095780045 + 6095780046.

It is an arithmetic number, because the mean of its divisors is an integer number (6095780046).

Almost surely, 2^12191560091 is an apocalyptic number.

12191560091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12191560091 is an equidigital number, since it uses as much as digits as its factorization.

12191560091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 35.

The spelling of 12191560091 in words is "twelve billion, one hundred ninety-one million, five hundred sixty thousand, ninety-one".