13129806817 has 2 divisors, whose sum is σ = 13129806818. Its totient is φ = 13129806816.

The previous prime is 13129806779. The next prime is 13129806883. The reversal of 13129806817 is 71860892131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8144882001 + 4984924816 = 90249^2 + 70604^2 .

It is a cyclic number.

It is not a de Polignac number, because 13129806817 - 2⁷ = 13129806689 is a prime.

It is not a weakly prime, because it can be changed into another prime (13129806617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6564903408 + 6564903409.

It is an arithmetic number, because the mean of its divisors is an integer number (6564903409).

Almost surely, 2^13129806817 is an apocalyptic number.

It is an amenable number.

13129806817 is a deficient number, since it is larger than the sum of its proper divisors (1).

13129806817 is an equidigital number, since it uses as much as digits as its factorization.

13129806817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 13129806817 in words is "thirteen billion, one hundred twenty-nine million, eight hundred six thousand, eight hundred seventeen".