129206871 has 6 divisors (see below), whose sum is σ = 186632160. Its totient is φ = 86137908.

The previous prime is 129206863. The next prime is 129206899. The reversal of 129206871 is 178602921.

It is not a de Polignac number, because 129206871 - 2³ = 129206863 is a prime.

It is a super-2 number, since 2×129206871² = 33388831027221282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129206071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7178151 + ... + 7178168.

It is an arithmetic number, because the mean of its divisors is an integer number (31105360).

Almost surely, 2^129206871 is an apocalyptic number.

129206871 is a deficient number, since it is larger than the sum of its proper divisors (57425289).

129206871 is a wasteful number, since it uses less digits than its factorization.

129206871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14356325 (or 14356322 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 129206871 is about 11366.9200313893. The cubic root of 129206871 is about 505.5473867179.

Subtracting from 129206871 its product of nonzero digits (12096), we obtain a triangular number (129194775 = T₁₆₀₇₄).

It can be divided in two parts, 12920 and 6871, that added together give a palindrome (19791).

The spelling of 129206871 in words is "one hundred twenty-nine million, two hundred six thousand, eight hundred seventy-one".