129997515 has 8 divisors (see below), whose sum is σ = 207996048. Its totient is φ = 69332000.

The previous prime is 129997513. The next prime is 129997537. The reversal of 129997515 is 515799921.

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

It is not a de Polignac number, because 129997515 - 2¹ = 129997513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129997513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4333236 + ... + 4333265.

It is an arithmetic number, because the mean of its divisors is an integer number (25999506).

Almost surely, 2^129997515 is an apocalyptic number.

129997515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129997515 is a deficient number, since it is larger than the sum of its proper divisors (77998533).

129997515 is an equidigital number, since it uses as much as digits as its factorization.

129997515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8666509.

The product of its digits is 255150, while the sum is 48.

The square root of 129997515 is about 11401.6452760117. The cubic root of 129997515 is about 506.5764740676.

The spelling of 129997515 in words is "one hundred twenty-nine million, nine hundred ninety-seven thousand, five hundred fifteen".