129581039 has 24 divisors (see below), whose sum is σ = 154173600. Its totient is φ = 108573696.

The previous prime is 129581029. The next prime is 129581069. The reversal of 129581039 is 930185921.

It is a de Polignac number, because none of the positive numbers 2^k-129581039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129580993 and 129581011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129581029) 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, 651062 + ... + 651260.

It is an arithmetic number, because the mean of its divisors is an integer number (6423900).

Almost surely, 2^129581039 is an apocalyptic number.

129581039 is a deficient number, since it is larger than the sum of its proper divisors (24592561).

129581039 is a wasteful number, since it uses less digits than its factorization.

129581039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 129581039 is about 11383.3667691066. The cubic root of 129581039 is about 506.0349184608.

The spelling of 129581039 in words is "one hundred twenty-nine million, five hundred eighty-one thousand, thirty-nine".