129589991 has 4 divisors (see below), whose sum is σ = 130779000. Its totient is φ = 128400984.

The previous prime is 129589973. The next prime is 129590011. The reversal of 129589991 is 199985921.

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 129589991 - 2⁶ = 129589927 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 (129589921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594341 + ... + 594558.

It is an arithmetic number, because the mean of its divisors is an integer number (32694750).

Almost surely, 2^129589991 is an apocalyptic number.

129589991 is a deficient number, since it is larger than the sum of its proper divisors (1189009).

129589991 is a wasteful number, since it uses less digits than its factorization.

129589991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189008.

The product of its digits is 524880, while the sum is 53.

The square root of 129589991 is about 11383.7599676030. The cubic root of 129589991 is about 506.0465711951.

The spelling of 129589991 in words is "one hundred twenty-nine million, five hundred eighty-nine thousand, nine hundred ninety-one".