129966971 has 4 divisors (see below), whose sum is σ = 132419232. Its totient is φ = 127514712.

The previous prime is 129966959. The next prime is 129966983. The reversal of 129966971 is 179669921.

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

It is an interprime number because it is at equal distance from previous prime (129966959) and next prime (129966983).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129966971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129966271) 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 3 ways as a sum of consecutive naturals, for example, 1226051 + ... + 1226156.

It is an arithmetic number, because the mean of its divisors is an integer number (33104808).

Almost surely, 2^129966971 is an apocalyptic number.

129966971 is a deficient number, since it is larger than the sum of its proper divisors (2452261).

129966971 is an equidigital number, since it uses as much as digits as its factorization.

129966971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452260.

The product of its digits is 367416, while the sum is 50.

The square root of 129966971 is about 11400.3057415141. The cubic root of 129966971 is about 506.5367961711.

The spelling of 129966971 in words is "one hundred twenty-nine million, nine hundred sixty-six thousand, nine hundred seventy-one".