129500015 has 8 divisors (see below), whose sum is σ = 156299328. Its totient is φ = 103000480.

The previous prime is 129499973. The next prime is 129500023. The reversal of 129500015 is 510005921.

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

It is not a de Polignac number, because 129500015 - 2²² = 125305711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73991 + ... + 75720.

It is an arithmetic number, because the mean of its divisors is an integer number (19537416).

Almost surely, 2^129500015 is an apocalyptic number.

129500015 is a deficient number, since it is larger than the sum of its proper divisors (26799313).

129500015 is a wasteful number, since it uses less digits than its factorization.

129500015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149889.

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

The square root of 129500015 is about 11379.8073358032. The cubic root of 129500015 is about 505.9294258615.

Adding to 129500015 its reverse (510005921), we get a palindrome (639505936).

The spelling of 129500015 in words is "one hundred twenty-nine million, five hundred thousand, fifteen".