129748515 has 32 divisors (see below), whose sum is σ = 226926336. Its totient is φ = 62916480.

The previous prime is 129748513. The next prime is 129748517. The reversal of 129748515 is 515847921.

It is an interprime number because it is at equal distance from previous prime (129748513) and next prime (129748517).

It is not a de Polignac number, because 129748515 - 2¹ = 129748513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129748513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8100 + ... + 18030.

It is an arithmetic number, because the mean of its divisors is an integer number (7091448).

Almost surely, 2^129748515 is an apocalyptic number.

129748515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129748515 is a deficient number, since it is larger than the sum of its proper divisors (97177821).

129748515 is a wasteful number, since it uses less digits than its factorization.

129748515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10019.

The product of its digits is 100800, while the sum is 42.

The square root of 129748515 is about 11390.7205654427. The cubic root of 129748515 is about 506.2528315647.

The spelling of 129748515 in words is "one hundred twenty-nine million, seven hundred forty-eight thousand, five hundred fifteen".