129442591 has 8 divisors (see below), whose sum is σ = 131162624. Its totient is φ = 127733760.

The previous prime is 129442583. The next prime is 129442609. The reversal of 129442591 is 195244921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129442591 - 2³ = 129442583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129442591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129442561) 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 7 ways as a sum of consecutive naturals, for example, 21871 + ... + 27151.

It is an arithmetic number, because the mean of its divisors is an integer number (16395328).

Almost surely, 2^129442591 is an apocalyptic number.

129442591 is a deficient number, since it is larger than the sum of its proper divisors (1720033).

129442591 is a wasteful number, since it uses less digits than its factorization.

129442591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5601.

The product of its digits is 25920, while the sum is 37.

The square root of 129442591 is about 11377.2839904786. The cubic root of 129442591 is about 505.8546336266.

The spelling of 129442591 in words is "one hundred twenty-nine million, four hundred forty-two thousand, five hundred ninety-one".