129512557 has 8 divisors (see below), whose sum is σ = 131075000. Its totient is φ = 127954944.

The previous prime is 129512497. The next prime is 129512561. The reversal of 129512557 is 755215921.

It can be written as a sum of positive squares in 4 ways, for example, as 11703241 + 117809316 = 3421^2 + 10854^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129512557 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 (129512587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103069 + ... + 104317.

It is an arithmetic number, because the mean of its divisors is an integer number (16384375).

Almost surely, 2^129512557 is an apocalyptic number.

It is an amenable number.

129512557 is a deficient number, since it is larger than the sum of its proper divisors (1562443).

129512557 is a wasteful number, since it uses less digits than its factorization.

129512557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2415.

The product of its digits is 31500, while the sum is 37.

The square root of 129512557 is about 11380.3583862724. The cubic root of 129512557 is about 505.9457583230.

The spelling of 129512557 in words is "one hundred twenty-nine million, five hundred twelve thousand, five hundred fifty-seven".