12391911569 has 2 divisors, whose sum is σ = 12391911570. Its totient is φ = 12391911568.

The previous prime is 12391911523. The next prime is 12391911599. The reversal of 12391911569 is 96511919321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9763811344 + 2628100225 = 98812^2 + 51265^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12391911569 is a prime.

It is a super-2 number, since 2×12391911569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12391911599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6195955784 + 6195955785.

It is an arithmetic number, because the mean of its divisors is an integer number (6195955785).

Almost surely, 2^12391911569 is an apocalyptic number.

It is an amenable number.

12391911569 is a deficient number, since it is larger than the sum of its proper divisors (1).

12391911569 is an equidigital number, since it uses as much as digits as its factorization.

12391911569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131220, while the sum is 47.

The spelling of 12391911569 in words is "twelve billion, three hundred ninety-one million, nine hundred eleven thousand, five hundred sixty-nine".