12391504009 has 2 divisors, whose sum is σ = 12391504010. Its totient is φ = 12391504008.

The previous prime is 12391503937. The next prime is 12391504031. The reversal of 12391504009 is 90040519321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12181978384 + 209525625 = 110372^2 + 14475^2 .

It is a cyclic number.

It is not a de Polignac number, because 12391504009 - 2³³ = 3801569417 is a prime.

It is not a weakly prime, because it can be changed into another prime (12391504079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6195752004 + 6195752005.

It is an arithmetic number, because the mean of its divisors is an integer number (6195752005).

Almost surely, 2^12391504009 is an apocalyptic number.

It is an amenable number.

12391504009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12391504009 is an equidigital number, since it uses as much as digits as its factorization.

12391504009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The spelling of 12391504009 in words is "twelve billion, three hundred ninety-one million, five hundred four thousand, nine".