13129806881 has 4 divisors (see below), whose sum is σ = 13138166064. Its totient is φ = 13121447700.

The previous prime is 13129806817. The next prime is 13129806883. The reversal of 13129806881 is 18860892131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18860892131 = 17 ⋅1109464243.

It is a cyclic number.

It is not a de Polignac number, because 13129806881 - 2⁶ = 13129806817 is a prime.

It is a super-2 number, since 2×13129806881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13129806883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4177235 + ... + 4180376.

It is an arithmetic number, because the mean of its divisors is an integer number (3284541516).

Almost surely, 2^13129806881 is an apocalyptic number.

It is an amenable number.

13129806881 is a deficient number, since it is larger than the sum of its proper divisors (8359183).

13129806881 is an equidigital number, since it uses as much as digits as its factorization.

13129806881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8359182.

The product of its (nonzero) digits is 165888, while the sum is 47.

The spelling of 13129806881 in words is "thirteen billion, one hundred twenty-nine million, eight hundred six thousand, eight hundred eighty-one".