129205087 has 8 divisors (see below), whose sum is σ = 141966720. Its totient is φ = 116612760.

The previous prime is 129205081. The next prime is 129205091. The reversal of 129205087 is 780502921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-129205087 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 (129205081) 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 7 ways as a sum of consecutive naturals, for example, 40723 + ... + 43780.

It is an arithmetic number, because the mean of its divisors is an integer number (17745840).

Almost surely, 2^129205087 is an apocalyptic number.

129205087 is a deficient number, since it is larger than the sum of its proper divisors (12761633).

129205087 is a wasteful number, since it uses less digits than its factorization.

129205087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84653.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 129205087 is about 11366.8415577943. The cubic root of 129205087 is about 505.5450599564.

The spelling of 129205087 in words is "one hundred twenty-nine million, two hundred five thousand, eighty-seven".