129513509 has 4 divisors (see below), whose sum is σ = 130262316. Its totient is φ = 128764704.

The previous prime is 129513491. The next prime is 129513511. The reversal of 129513509 is 905315921.

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 82864609 + 46648900 = 9103^2 + 6830^2 .

It is a cyclic number.

It is not a de Polignac number, because 129513509 - 2²⁰ = 128464933 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 (129513569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374144 + ... + 374489.

It is an arithmetic number, because the mean of its divisors is an integer number (32565579).

Almost surely, 2^129513509 is an apocalyptic number.

It is an amenable number.

129513509 is a deficient number, since it is larger than the sum of its proper divisors (748807).

129513509 is an equidigital number, since it uses as much as digits as its factorization.

129513509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748806.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 129513509 is about 11380.4002126463. The cubic root of 129513509 is about 505.9469979948.

The spelling of 129513509 in words is "one hundred twenty-nine million, five hundred thirteen thousand, five hundred nine".