129171232 has 12 divisors (see below), whose sum is σ = 254305926. Its totient is φ = 64585600.

The previous prime is 129171187. The next prime is 129171247. The reversal of 129171232 is 232171921.

It can be written as a sum of positive squares in only one way, i.e., 114147856 + 15023376 = 10684^2 + 3876^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129171232.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2018269 + ... + 2018332.

Almost surely, 2^129171232 is an apocalyptic number.

It is an amenable number.

129171232 is a deficient number, since it is larger than the sum of its proper divisors (125134694).

129171232 is an equidigital number, since it uses as much as digits as its factorization.

129171232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036611 (or 4036603 counting only the distinct ones).

The product of its digits is 1512, while the sum is 28.

The square root of 129171232 is about 11365.3522602689. The cubic root of 129171232 is about 505.5009009028.

The spelling of 129171232 in words is "one hundred twenty-nine million, one hundred seventy-one thousand, two hundred thirty-two".