129515752049 has 4 divisors (see below), whose sum is σ = 129520534080. Its totient is φ = 129510970020.

The previous prime is 129515752039. The next prime is 129515752057. The reversal of 129515752049 is 940257515921.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129515752049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129515751988 and 129515752006.

It is not an unprimeable number, because it can be changed into a prime (129515752039) 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, 2350157 + ... + 2404634.

It is an arithmetic number, because the mean of its divisors is an integer number (32380133520).

Almost surely, 2^129515752049 is an apocalyptic number.

It is an amenable number.

129515752049 is a deficient number, since it is larger than the sum of its proper divisors (4782031).

129515752049 is an equidigital number, since it uses as much as digits as its factorization.

129515752049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782030.

The product of its (nonzero) digits is 1134000, while the sum is 50.

The spelling of 129515752049 in words is "one hundred twenty-nine billion, five hundred fifteen million, seven hundred fifty-two thousand, forty-nine".