12154868191 has 2 divisors, whose sum is σ = 12154868192. Its totient is φ = 12154868190.

The previous prime is 12154868111. The next prime is 12154868203. The reversal of 12154868191 is 19186845121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12154868191 - 2⁹ = 12154867679 is a prime.

It is a super-2 number, since 2×12154868191² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12154868111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077434095 + 6077434096.

It is an arithmetic number, because the mean of its divisors is an integer number (6077434096).

Almost surely, 2^12154868191 is an apocalyptic number.

12154868191 is a deficient number, since it is larger than the sum of its proper divisors (1).

12154868191 is an equidigital number, since it uses as much as digits as its factorization.

12154868191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 46.

The spelling of 12154868191 in words is "twelve billion, one hundred fifty-four million, eight hundred sixty-eight thousand, one hundred ninety-one".