12691107829 has 2 divisors, whose sum is σ = 12691107830. Its totient is φ = 12691107828.

The previous prime is 12691107823. The next prime is 12691107839. The reversal of 12691107829 is 92870119621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12121569604 + 569538225 = 110098^2 + 23865^2 .

It is a cyclic number.

It is not a de Polignac number, because 12691107829 - 2²⁹ = 12154236917 is a prime.

It is a super-2 number, since 2×12691107829² (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 (12691107823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6345553914 + 6345553915.

It is an arithmetic number, because the mean of its divisors is an integer number (6345553915).

Almost surely, 2^12691107829 is an apocalyptic number.

It is an amenable number.

12691107829 is a deficient number, since it is larger than the sum of its proper divisors (1).

12691107829 is an equidigital number, since it uses as much as digits as its factorization.

12691107829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 46.

The spelling of 12691107829 in words is "twelve billion, six hundred ninety-one million, one hundred seven thousand, eight hundred twenty-nine".