129551529 has 4 divisors (see below), whose sum is σ = 172735376. Its totient is φ = 86367684.

The previous prime is 129551501. The next prime is 129551531. The reversal of 129551529 is 925155921.

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 not a de Polignac number, because 129551529 - 2⁹ = 129551017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129551549) 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, 21591919 + ... + 21591924.

It is an arithmetic number, because the mean of its divisors is an integer number (43183844).

Almost surely, 2^129551529 is an apocalyptic number.

It is an amenable number.

129551529 is a deficient number, since it is larger than the sum of its proper divisors (43183847).

129551529 is an equidigital number, since it uses as much as digits as its factorization.

129551529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43183846.

The product of its digits is 40500, while the sum is 39.

The square root of 129551529 is about 11382.0705058438. The cubic root of 129551529 is about 505.9965017698.

The spelling of 129551529 in words is "one hundred twenty-nine million, five hundred fifty-one thousand, five hundred twenty-nine".