129443429813 has 4 divisors (see below), whose sum is σ = 129446660460. Its totient is φ = 129440199168.

The previous prime is 129443429777. The next prime is 129443429861. The reversal of 129443429813 is 318924344921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 113546759089 + 15896670724 = 336967^2 + 126082^2 .

It is a cyclic number.

It is not a de Polignac number, because 129443429813 - 2¹⁶ = 129443364277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129443429513) 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, 1554458 + ... + 1635611.

It is an arithmetic number, because the mean of its divisors is an integer number (32361665115).

Almost surely, 2^129443429813 is an apocalyptic number.

It is an amenable number.

129443429813 is a deficient number, since it is larger than the sum of its proper divisors (3230647).

129443429813 is an equidigital number, since it uses as much as digits as its factorization.

129443429813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230646.

The product of its digits is 1492992, while the sum is 50.

The spelling of 129443429813 in words is "one hundred twenty-nine billion, four hundred forty-three million, four hundred twenty-nine thousand, eight hundred thirteen".