129117500 has 30 divisors (see below), whose sum is σ = 282359616. Its totient is φ = 51646000.

The previous prime is 129117493. The next prime is 129117503. The reversal of 129117500 is 5711921.

It is a self number, because there is not a number n which added to its sum of digits gives 129117500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129117503) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 23324 + ... + 28323.

Almost surely, 2^129117500 is an apocalyptic number.

129117500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129117500 is an abundant number, since it is smaller than the sum of its proper divisors (153242116).

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

129117500 is an equidigital number, since it uses as much as digits as its factorization.

129117500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51671 (or 51654 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 26.

The square root of 129117500 is about 11362.9881633310. The cubic root of 129117500 is about 505.4307992735.

The spelling of 129117500 in words is "one hundred twenty-nine million, one hundred seventeen thousand, five hundred".