129156100 has 36 divisors (see below), whose sum is σ = 284231808. Its totient is φ = 50932000.

The previous prime is 129156061. The next prime is 129156107. The reversal of 129156100 is 1651921.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (129156107) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1996 + ... + 16195.

It is an arithmetic number, because the mean of its divisors is an integer number (7895328).

Almost surely, 2^129156100 is an apocalyptic number.

129156100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129156100 is an abundant number, since it is smaller than the sum of its proper divisors (155075708).

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

129156100 is a wasteful number, since it uses less digits than its factorization.

129156100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18276 (or 18269 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 129156100 is about 11364.6865332925. The cubic root of 129156100 is about 505.4811608564.

The spelling of 129156100 in words is "one hundred twenty-nine million, one hundred fifty-six thousand, one hundred".