129109012 has 6 divisors (see below), whose sum is σ = 225940778. Its totient is φ = 64554504.

The previous prime is 129108997. The next prime is 129109031. The reversal of 129109012 is 210901921.

It can be written as a sum of positive squares in only one way, i.e., 86936976 + 42172036 = 9324^2 + 6494^2 .

It is a super-2 number, since 2×129109012² = 33338273959232288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16138623 + ... + 16138630.

Almost surely, 2^129109012 is an apocalyptic number.

It is an amenable number.

129109012 is a deficient number, since it is larger than the sum of its proper divisors (96831766).

129109012 is a wasteful number, since it uses less digits than its factorization.

129109012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32277257 (or 32277255 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 129109012 is about 11362.6146638879. The cubic root of 129109012 is about 505.4197235979.

The spelling of 129109012 in words is "one hundred twenty-nine million, one hundred nine thousand, twelve".