129436357129 has 4 divisors (see below), whose sum is σ = 133611723520. Its totient is φ = 125260990740.

The previous prime is 129436357097. The next prime is 129436357139. The reversal of 129436357129 is 921753634921.

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.

It is a cyclic number.

It is not a de Polignac number, because 129436357129 - 2⁵ = 129436357097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129436357139) 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, 2087683149 + ... + 2087683210.

It is an arithmetic number, because the mean of its divisors is an integer number (33402930880).

Almost surely, 2^129436357129 is an apocalyptic number.

It is an amenable number.

129436357129 is a deficient number, since it is larger than the sum of its proper divisors (4175366391).

129436357129 is an equidigital number, since it uses as much as digits as its factorization.

129436357129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175366390.

The product of its digits is 2449440, while the sum is 52.

The spelling of 129436357129 in words is "one hundred twenty-nine billion, four hundred thirty-six million, three hundred fifty-seven thousand, one hundred twenty-nine".