129871 has 4 divisors (see below), whose sum is σ = 148432. Its totient is φ = 111312.

The previous prime is 129853. The next prime is 129887. The reversal of 129871 is 178921.

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

It is a cyclic number.

It is not a de Polignac number, because 129871 - 2¹⁵ = 97103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9270 + ... + 9283.

It is an arithmetic number, because the mean of its divisors is an integer number (37108).

2¹²⁹⁸⁷¹ is an apocalyptic number.

129871 is a deficient number, since it is larger than the sum of its proper divisors (18561).

129871 is an equidigital number, since it uses as much as digits as its factorization.

129871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18560.

The product of its digits is 1008, while the sum is 28.

The square root of 129871 is about 360.3761923324. The cubic root of 129871 is about 50.6412085477.

It can be divided in two parts, 1298 and 71, that added together give a square (1369 = 37²).

The spelling of 129871 in words is "one hundred twenty-nine thousand, eight hundred seventy-one".