129538189 has 4 divisors (see below), whose sum is σ = 141314400. Its totient is φ = 117761980.

The previous prime is 129538187. The next prime is 129538193. The reversal of 129538189 is 981835921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129538189 - 2¹ = 129538187 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 (129538187) 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, 5888089 + ... + 5888110.

It is an arithmetic number, because the mean of its divisors is an integer number (35328600).

Almost surely, 2^129538189 is an apocalyptic number.

It is an amenable number.

129538189 is a deficient number, since it is larger than the sum of its proper divisors (11776211).

129538189 is a wasteful number, since it uses less digits than its factorization.

129538189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11776210.

The product of its digits is 155520, while the sum is 46.

The square root of 129538189 is about 11381.4844813847. The cubic root of 129538189 is about 505.9791335842.

The spelling of 129538189 in words is "one hundred twenty-nine million, five hundred thirty-eight thousand, one hundred eighty-nine".