129562009 has 8 divisors (see below), whose sum is σ = 133130088. Its totient is φ = 126013440.

The previous prime is 129562003. The next prime is 129562019. The reversal of 129562009 is 900265921.

It can be written as a sum of positive squares in 4 ways, for example, as 6906384 + 122655625 = 2628^2 + 11075^2 .

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 129562009 - 2³ = 129562001 is a prime.

It is a super-2 number, since 2×129562009² = 33572628352232162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129562001) 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, 9129 + ... + 18505.

It is an arithmetic number, because the mean of its divisors is an integer number (16641261).

Almost surely, 2^129562009 is an apocalyptic number.

It is an amenable number.

129562009 is a deficient number, since it is larger than the sum of its proper divisors (3568079).

129562009 is an equidigital number, since it uses as much as digits as its factorization.

129562009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9755.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 129562009 is about 11382.5308697143. The cubic root of 129562009 is about 506.0101455053.

The spelling of 129562009 in words is "one hundred twenty-nine million, five hundred sixty-two thousand, nine".