129800999 has 4 divisors (see below), whose sum is σ = 133988160. Its totient is φ = 125613840.

The previous prime is 129800987. The next prime is 129801019. The reversal of 129800999 is 999008921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129800999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129800929) 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 3 ways as a sum of consecutive naturals, for example, 2093534 + ... + 2093595.

It is an arithmetic number, because the mean of its divisors is an integer number (33497040).

Almost surely, 2^129800999 is an apocalyptic number.

129800999 is a deficient number, since it is larger than the sum of its proper divisors (4187161).

129800999 is an equidigital number, since it uses as much as digits as its factorization.

129800999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4187160.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 129800999 is about 11393.0241376028. The cubic root of 129800999 is about 506.3210830634.

The spelling of 129800999 in words is "one hundred twenty-nine million, eight hundred thousand, nine hundred ninety-nine".