129526936509 has 4 divisors (see below), whose sum is σ = 172702582016. Its totient is φ = 86351291004.

The previous prime is 129526936501. The next prime is 129526936529. The reversal of 129526936509 is 905639625921.

It is a happy number.

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: 905639625921 = 3 ⋅301879875307.

It is not a de Polignac number, because 129526936509 - 2³ = 129526936501 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 (129526936501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21587822749 + ... + 21587822754.

It is an arithmetic number, because the mean of its divisors is an integer number (43175645504).

Almost surely, 2^129526936509 is an apocalyptic number.

It is an amenable number.

129526936509 is a deficient number, since it is larger than the sum of its proper divisors (43175645507).

129526936509 is an equidigital number, since it uses as much as digits as its factorization.

129526936509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43175645506.

The product of its (nonzero) digits is 7873200, while the sum is 57.

The spelling of 129526936509 in words is "one hundred twenty-nine billion, five hundred twenty-six million, nine hundred thirty-six thousand, five hundred nine".