12315871517 has 2 divisors, whose sum is σ = 12315871518. Its totient is φ = 12315871516.

The previous prime is 12315871507. The next prime is 12315871543. The reversal of 12315871517 is 71517851321.

12315871517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11386170436 + 929701081 = 106706^2 + 30491^2 .

It is a cyclic number.

It is not a de Polignac number, because 12315871517 - 2¹⁴ = 12315855133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12315871507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6157935758 + 6157935759.

It is an arithmetic number, because the mean of its divisors is an integer number (6157935759).

Almost surely, 2^12315871517 is an apocalyptic number.

It is an amenable number.

12315871517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12315871517 is an equidigital number, since it uses as much as digits as its factorization.

12315871517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58800, while the sum is 41.

The spelling of 12315871517 in words is "twelve billion, three hundred fifteen million, eight hundred seventy-one thousand, five hundred seventeen".