129141871 has 4 divisors (see below), whose sum is σ = 129855544. Its totient is φ = 128428200.

The previous prime is 129141869. The next prime is 129141907. The reversal of 129141871 is 178141921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178141921 = 6947 ⋅25643.

It is a cyclic number.

It is not a de Polignac number, because 129141871 - 2¹ = 129141869 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 (129141811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356565 + ... + 356926.

It is an arithmetic number, because the mean of its divisors is an integer number (32463886).

Almost surely, 2^129141871 is an apocalyptic number.

129141871 is a deficient number, since it is larger than the sum of its proper divisors (713673).

129141871 is an equidigital number, since it uses as much as digits as its factorization.

129141871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713672.

The product of its digits is 4032, while the sum is 34.

The square root of 129141871 is about 11364.0604979030. The cubic root of 129141871 is about 505.4625973879.

Subtracting 129141871 from its reverse (178141921), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 129141871 in words is "one hundred twenty-nine million, one hundred forty-one thousand, eight hundred seventy-one".