129161312 has 24 divisors (see below), whose sum is σ = 290613456. Its totient is φ = 55354752.

The previous prime is 129161269. The next prime is 129161317. The reversal of 129161312 is 213161921.

It is a super-2 number, since 2×129161312² = 33365289035122688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129161317) 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 3 ways as a sum of consecutive naturals, for example, 288083 + ... + 288530.

It is an arithmetic number, because the mean of its divisors is an integer number (12108894).

Almost surely, 2^129161312 is an apocalyptic number.

It is an amenable number.

129161312 is an abundant number, since it is smaller than the sum of its proper divisors (161452144).

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

129161312 is an equidigital number, since it uses as much as digits as its factorization.

129161312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576630 (or 576622 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

The square root of 129161312 is about 11364.9158377878. The cubic root of 129161312 is about 505.4879602059.

The spelling of 129161312 in words is "one hundred twenty-nine million, one hundred sixty-one thousand, three hundred twelve".