129515 has 4 divisors (see below), whose sum is σ = 155424. Its totient is φ = 103608.

The previous prime is 129509. The next prime is 129517. The reversal of 129515 is 515921.

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 129515 - 2⁴ = 129499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129517) by changing a digit.

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, 12947 + ... + 12956.

It is an arithmetic number, because the mean of its divisors is an integer number (38856).

2¹²⁹⁵¹⁵ is an apocalyptic number.

129515 is a deficient number, since it is larger than the sum of its proper divisors (25909).

129515 is an equidigital number, since it uses as much as digits as its factorization.

129515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25908.

The product of its digits is 450, while the sum is 23.

The square root of 129515 is about 359.8819250810. The cubic root of 129515 is about 50.5948939527.

The spelling of 129515 in words is "one hundred twenty-nine thousand, five hundred fifteen".