129861100 has 18 divisors (see below), whose sum is σ = 281798804. Its totient is φ = 51944400.

The previous prime is 129861097. The next prime is 129861103. The reversal of 129861100 is 1168921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129861097) and next prime (129861103).

It is not an unprimeable number, because it can be changed into a prime (129861103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 649206 + ... + 649405.

Almost surely, 2^129861100 is an apocalyptic number.

129861100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129861100 is an abundant number, since it is smaller than the sum of its proper divisors (151937704).

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

129861100 is a wasteful number, since it uses less digits than its factorization.

129861100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298625 (or 1298618 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 129861100 is about 11395.6614551328. The cubic root of 129861100 is about 506.3992173053.

The spelling of 129861100 in words is "one hundred twenty-nine million, eight hundred sixty-one thousand, one hundred".