129492517 has 8 divisors (see below), whose sum is σ = 161445312. Its totient is φ = 100903200.

The previous prime is 129492509. The next prime is 129492523. The reversal of 129492517 is 715294921.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 129492517 - 2³ = 129492509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129492517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129492017) 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 7 ways as a sum of consecutive naturals, for example, 840784 + ... + 840937.

It is an arithmetic number, because the mean of its divisors is an integer number (20180664).

Almost surely, 2^129492517 is an apocalyptic number.

It is an amenable number.

129492517 is a deficient number, since it is larger than the sum of its proper divisors (31952795).

129492517 is a wasteful number, since it uses less digits than its factorization.

129492517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681739.

The product of its digits is 45360, while the sum is 40.

The square root of 129492517 is about 11379.4778878471. The cubic root of 129492517 is about 505.9196613014.

The spelling of 129492517 in words is "one hundred twenty-nine million, four hundred ninety-two thousand, five hundred seventeen".