12591112817 has 2 divisors, whose sum is σ = 12591112818. Its totient is φ = 12591112816.

The previous prime is 12591112741. The next prime is 12591112921. The reversal of 12591112817 is 71821119521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12062848561 + 528264256 = 109831^2 + 22984^2 .

It is a cyclic number.

It is not a de Polignac number, because 12591112817 - 2⁸ = 12591112561 is a prime.

It is a super-2 number, since 2×12591112817² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12591111817) 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, 6295556408 + 6295556409.

It is an arithmetic number, because the mean of its divisors is an integer number (6295556409).

Almost surely, 2^12591112817 is an apocalyptic number.

It is an amenable number.

12591112817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12591112817 is an equidigital number, since it uses as much as digits as its factorization.

12591112817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 38.

The spelling of 12591112817 in words is "twelve billion, five hundred ninety-one million, one hundred twelve thousand, eight hundred seventeen".