129891012 has 12 divisors (see below), whose sum is σ = 303079056. Its totient is φ = 43297000.

The previous prime is 129891001. The next prime is 129891043. The reversal of 129891012 is 210198921.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5412114 + ... + 5412137.

It is an arithmetic number, because the mean of its divisors is an integer number (25256588).

Almost surely, 2^129891012 is an apocalyptic number.

129891012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129891012 is an abundant number, since it is smaller than the sum of its proper divisors (173188044).

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

129891012 is a wasteful number, since it uses less digits than its factorization.

129891012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10824258 (or 10824256 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 129891012 is about 11396.9738088670. The cubic root of 129891012 is about 506.4380953849.

The spelling of 129891012 in words is "one hundred twenty-nine million, eight hundred ninety-one thousand, twelve".