129609971 has 4 divisors (see below), whose sum is σ = 129651000. Its totient is φ = 129568944.

The previous prime is 129609929. The next prime is 129610021. The reversal of 129609971 is 179906921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 179906921 = 149 ⋅1207429.

It is a cyclic number.

It is not a de Polignac number, because 129609971 - 2¹⁴ = 129593587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129609901) 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 3 ways as a sum of consecutive naturals, for example, 15341 + ... + 22238.

It is an arithmetic number, because the mean of its divisors is an integer number (32412750).

Almost surely, 2^129609971 is an apocalyptic number.

129609971 is a deficient number, since it is larger than the sum of its proper divisors (41029).

129609971 is an equidigital number, since it uses as much as digits as its factorization.

129609971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41028.

The product of its (nonzero) digits is 61236, while the sum is 44.

The square root of 129609971 is about 11384.6374997186. The cubic root of 129609971 is about 506.0725770382.

The spelling of 129609971 in words is "one hundred twenty-nine million, six hundred nine thousand, nine hundred seventy-one".