129040513 has 4 divisors (see below), whose sum is σ = 147474880. Its totient is φ = 110606148.

The previous prime is 129040453. The next prime is 129040519. The reversal of 129040513 is 315040921.

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: 315040921 = 13 ⋅24233917.

It is a cyclic number.

It is not a de Polignac number, because 129040513 - 2²⁵ = 95486081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129040519) 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, 9217173 + ... + 9217186.

It is an arithmetic number, because the mean of its divisors is an integer number (36868720).

Almost surely, 2^129040513 is an apocalyptic number.

It is an amenable number.

129040513 is a deficient number, since it is larger than the sum of its proper divisors (18434367).

129040513 is an equidigital number, since it uses as much as digits as its factorization.

129040513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18434366.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 129040513 is about 11359.6000369731. The cubic root of 129040513 is about 505.3303240288.

The spelling of 129040513 in words is "one hundred twenty-nine million, forty thousand, five hundred thirteen".