129538489 has 4 divisors (see below), whose sum is σ = 132551056. Its totient is φ = 126525924.

The previous prime is 129538481. The next prime is 129538531. The reversal of 129538489 is 984835921.

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 129538489 - 2³ = 129538481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129538481) 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, 1506219 + ... + 1506304.

It is an arithmetic number, because the mean of its divisors is an integer number (33137764).

Almost surely, 2^129538489 is an apocalyptic number.

It is an amenable number.

129538489 is a deficient number, since it is larger than the sum of its proper divisors (3012567).

129538489 is an equidigital number, since it uses as much as digits as its factorization.

129538489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012566.

The product of its digits is 622080, while the sum is 49.

The square root of 129538489 is about 11381.4976606772. The cubic root of 129538489 is about 505.9795241861.

The spelling of 129538489 in words is "one hundred twenty-nine million, five hundred thirty-eight thousand, four hundred eighty-nine".