129517418 has 4 divisors (see below), whose sum is σ = 194276130. Its totient is φ = 64758708.

The previous prime is 129517387. The next prime is 129517429. The reversal of 129517418 is 814715921.

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

It can be written as a sum of positive squares in only one way, i.e., 100540729 + 28976689 = 10027^2 + 5383^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32379353 + ... + 32379356.

Almost surely, 2^129517418 is an apocalyptic number.

129517418 is a deficient number, since it is larger than the sum of its proper divisors (64758712).

129517418 is an equidigital number, since it uses as much as digits as its factorization.

129517418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64758711.

The product of its digits is 20160, while the sum is 38.

The square root of 129517418 is about 11380.5719539925. The cubic root of 129517418 is about 505.9520881380.

The spelling of 129517418 in words is "one hundred twenty-nine million, five hundred seventeen thousand, four hundred eighteen".