129061100 has 54 divisors (see below), whose sum is σ = 325799460. Its totient is φ = 44247840.

The previous prime is 129061081. The next prime is 129061109. The reversal of 129061100 is 1160921.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (129061109) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8270 + ... + 18069.

Almost surely, 2^129061100 is an apocalyptic number.

129061100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129061100 is an abundant number, since it is smaller than the sum of its proper divisors (196738360).

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

129061100 is a wasteful number, since it uses less digits than its factorization.

129061100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26367 (or 26353 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 129061100 is about 11360.5061506959. The cubic root of 129061100 is about 505.3571959053.

The spelling of 129061100 in words is "one hundred twenty-nine million, sixty-one thousand, one hundred".