13129580861 has 2 divisors, whose sum is σ = 13129580862. Its totient is φ = 13129580860.

The previous prime is 13129580857. The next prime is 13129580903. The reversal of 13129580861 is 16808592131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11610062500 + 1519518361 = 107750^2 + 38981^2 .

It is a cyclic number.

It is not a de Polignac number, because 13129580861 - 2² = 13129580857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13119580861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6564790430 + 6564790431.

It is an arithmetic number, because the mean of its divisors is an integer number (6564790431).

Almost surely, 2^13129580861 is an apocalyptic number.

It is an amenable number.

13129580861 is a deficient number, since it is larger than the sum of its proper divisors (1).

13129580861 is an equidigital number, since it uses as much as digits as its factorization.

13129580861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 13129580861 in words is "thirteen billion, one hundred twenty-nine million, five hundred eighty thousand, eight hundred sixty-one".