129995529 has 8 divisors (see below), whose sum is σ = 174432000. Its totient is φ = 86111376.

The previous prime is 129995491. The next prime is 129995531. The reversal of 129995529 is 925599921.

It is a happy number.

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

It is not a de Polignac number, because 129995529 - 2¹¹ = 129993481 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129995599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137529 + ... + 138470.

It is an arithmetic number, because the mean of its divisors is an integer number (21804000).

Almost surely, 2^129995529 is an apocalyptic number.

It is an amenable number.

129995529 is a deficient number, since it is larger than the sum of its proper divisors (44436471).

129995529 is a wasteful number, since it uses less digits than its factorization.

129995529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276159.

The product of its digits is 656100, while the sum is 51.

The square root of 129995529 is about 11401.5581829853. The cubic root of 129995529 is about 506.5738943619.

It can be divided in two parts, 12999 and 5529, that added together give a triangular number (18528 = T₁₉₂).

The spelling of 129995529 in words is "one hundred twenty-nine million, nine hundred ninety-five thousand, five hundred twenty-nine".