129049100 has 18 divisors (see below), whose sum is σ = 280036764. Its totient is φ = 51619600.

The previous prime is 129049093. The next prime is 129049111. The reversal of 129049100 is 1940921.

It is a self number, because there is not a number n which added to its sum of digits gives 129049100.

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 in 5 ways as a sum of consecutive naturals, for example, 645146 + ... + 645345.

It is an arithmetic number, because the mean of its divisors is an integer number (15557598).

Almost surely, 2^129049100 is an apocalyptic number.

129049100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129049100 is an abundant number, since it is smaller than the sum of its proper divisors (150987664).

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

129049100 is a wasteful number, since it uses less digits than its factorization.

129049100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290505 (or 1290498 counting only the distinct ones).

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

The square root of 129049100 is about 11359.9779929364. The cubic root of 129049100 is about 505.3415328477.

The spelling of 129049100 in words is "one hundred twenty-nine million, forty-nine thousand, one hundred".