129749971 has 8 divisors (see below), whose sum is σ = 139845440. Its totient is φ = 119670912.

The previous prime is 129749959. The next prime is 129750007. The reversal of 129749971 is 179947921.

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 129749971 - 2¹¹ = 129747923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129749951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16006 + ... + 22708.

It is an arithmetic number, because the mean of its divisors is an integer number (17480680).

Almost surely, 2^129749971 is an apocalyptic number.

129749971 is a deficient number, since it is larger than the sum of its proper divisors (10095469).

129749971 is a wasteful number, since it uses less digits than its factorization.

129749971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8205.

The product of its digits is 285768, while the sum is 49.

The square root of 129749971 is about 11390.7844769357. The cubic root of 129749971 is about 506.2547252315.

The spelling of 129749971 in words is "one hundred twenty-nine million, seven hundred forty-nine thousand, nine hundred seventy-one".