129557339 has 4 divisors (see below), whose sum is σ = 133736640. Its totient is φ = 125378040.

The previous prime is 129557327. The next prime is 129557369. The reversal of 129557339 is 933755921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129557339 - 2⁸ = 129557083 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129557339.

It is not an unprimeable number, because it can be changed into a prime (129557369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089604 + ... + 2089665.

It is an arithmetic number, because the mean of its divisors is an integer number (33434160).

Almost surely, 2^129557339 is an apocalyptic number.

129557339 is a deficient number, since it is larger than the sum of its proper divisors (4179301).

129557339 is an equidigital number, since it uses as much as digits as its factorization.

129557339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4179300.

The product of its digits is 255150, while the sum is 44.

The square root of 129557339 is about 11382.3257289536. The cubic root of 129557339 is about 506.0040658018.

The spelling of 129557339 in words is "one hundred twenty-nine million, five hundred fifty-seven thousand, three hundred thirty-nine".