129520006 has 32 divisors (see below), whose sum is σ = 245161728. Its totient is φ = 49849440.

The previous prime is 129519997. The next prime is 129520007. The reversal of 129520006 is 600025921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129520007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7716 + ... + 17848.

It is an arithmetic number, because the mean of its divisors is an integer number (7661304).

Almost surely, 2^129520006 is an apocalyptic number.

129520006 is a deficient number, since it is larger than the sum of its proper divisors (115641722).

129520006 is a wasteful number, since it uses less digits than its factorization.

129520006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10236.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 129520006 is about 11380.6856559699. The cubic root of 129520006 is about 505.9554580715.

Adding to 129520006 its reverse (600025921), we get a palindrome (729545927).

The spelling of 129520006 in words is "one hundred twenty-nine million, five hundred twenty thousand, six".