129275915 has 4 divisors (see below), whose sum is σ = 155131104. Its totient is φ = 103420728.

The previous prime is 129275899. The next prime is 129275929. The reversal of 129275915 is 519572921.

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

It is a cyclic number.

It is not a de Polignac number, because 129275915 - 2⁴ = 129275899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12927587 + ... + 12927596.

It is an arithmetic number, because the mean of its divisors is an integer number (38782776).

Almost surely, 2^129275915 is an apocalyptic number.

129275915 is a deficient number, since it is larger than the sum of its proper divisors (25855189).

129275915 is an equidigital number, since it uses as much as digits as its factorization.

129275915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25855188.

The product of its digits is 56700, while the sum is 41.

The square root of 129275915 is about 11369.9566841743. The cubic root of 129275915 is about 505.6374201089.

The spelling of 129275915 in words is "one hundred twenty-nine million, two hundred seventy-five thousand, nine hundred fifteen".