129131912 has 32 divisors (see below), whose sum is σ = 297998400. Its totient is φ = 51084864.

The previous prime is 129131879. The next prime is 129131917. The reversal of 129131912 is 219131921.

It is not an unprimeable number, because it can be changed into a prime (129131917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87962 + ... + 89417.

It is an arithmetic number, because the mean of its divisors is an integer number (9312450).

Almost surely, 2^129131912 is an apocalyptic number.

It is an amenable number.

129131912 is an abundant number, since it is smaller than the sum of its proper divisors (168866488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129131912 is a wasteful number, since it uses less digits than its factorization.

129131912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177405 (or 177401 counting only the distinct ones).

The product of its digits is 972, while the sum is 29.

The square root of 129131912 is about 11363.6223098095. The cubic root of 129131912 is about 505.4496038448.

Subtracting 129131912 from its reverse (219131921), we obtain a palindrome (90000009).

The spelling of 129131912 in words is "one hundred twenty-nine million, one hundred thirty-one thousand, nine hundred twelve".