129557323 has 24 divisors (see below), whose sum is σ = 163330992. Its totient is φ = 102057984.

The previous prime is 129557303. The next prime is 129557327. The reversal of 129557323 is 323755921.

It is not a de Polignac number, because 129557323 - 2¹⁷ = 129426251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129557327) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34011 + ... + 37627.

It is an arithmetic number, because the mean of its divisors is an integer number (6805458).

Almost surely, 2^129557323 is an apocalyptic number.

129557323 is a deficient number, since it is larger than the sum of its proper divisors (33773669).

129557323 is a wasteful number, since it uses less digits than its factorization.

129557323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691 (or 3684 counting only the distinct ones).

The product of its digits is 56700, while the sum is 37.

The square root of 129557323 is about 11382.3250261096. The cubic root of 129557323 is about 506.0040449718.

The spelling of 129557323 in words is "one hundred twenty-nine million, five hundred fifty-seven thousand, three hundred twenty-three".