129591720133 has 4 divisors (see below), whose sum is σ = 130417145260. Its totient is φ = 128766295008.

The previous prime is 129591720107. The next prime is 129591720149. The reversal of 129591720133 is 331027195921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 331027195921 = 827 ⋅400274723.

It can be written as a sum of positive squares in 2 ways, for example, as 46120998564 + 83470721569 = 214758^2 + 288913^2 .

It is a cyclic number.

It is not a de Polignac number, because 129591720133 - 2²⁹ = 129054849221 is a prime.

It is the 359989-th Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129591720133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129591720233) by changing a digit.

It is a nontrivial repunit in base 359988.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412712328 + ... + 412712641.

It is an arithmetic number, because the mean of its divisors is an integer number (32604286315).

Almost surely, 2^129591720133 is an apocalyptic number.

It is an amenable number.

129591720133 is a deficient number, since it is larger than the sum of its proper divisors (825425127).

129591720133 is an equidigital number, since it uses as much as digits as its factorization.

129591720133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825425126.

The product of its (nonzero) digits is 102060, while the sum is 43.

The spelling of 129591720133 in words is "one hundred twenty-nine billion, five hundred ninety-one million, seven hundred twenty thousand, one hundred thirty-three".