129564009 has 16 divisors (see below), whose sum is σ = 193814400. Its totient is φ = 85535568.

The previous prime is 129563999. The next prime is 129564073. The reversal of 129564009 is 900465921.

129564009 is a `hidden beast` number, since 1 + 2 + 9 + 5 + 640 + 0 + 9 = 666.

It is not a de Polignac number, because 129564009 - 2⁷ = 129563881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129564709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20514 + ... + 26075.

It is an arithmetic number, because the mean of its divisors is an integer number (12113400).

Almost surely, 2^129564009 is an apocalyptic number.

It is an amenable number.

129564009 is a deficient number, since it is larger than the sum of its proper divisors (64250391).

129564009 is a wasteful number, since it uses less digits than its factorization.

129564009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46701 (or 46695 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 129564009 is about 11382.6187232991. The cubic root of 129564009 is about 506.0127491880.

The spelling of 129564009 in words is "one hundred twenty-nine million, five hundred sixty-four thousand, nine".