129597209 has 12 divisors (see below), whose sum is σ = 152668800. Its totient is φ = 109673928.

The previous prime is 129597197. The next prime is 129597211. The reversal of 129597209 is 902795921.

It is a happy number.

It is not a de Polignac number, because 129597209 - 2⁸ = 129596953 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 129597209.

It is not an unprimeable number, because it can be changed into a prime (129597289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12869 + ... + 20610.

It is an arithmetic number, because the mean of its divisors is an integer number (12722400).

Almost surely, 2^129597209 is an apocalyptic number.

It is an amenable number.

129597209 is a deficient number, since it is larger than the sum of its proper divisors (23071591).

129597209 is an equidigital number, since it uses as much as digits as its factorization.

129597209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33572 (or 33565 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 129597209 is about 11384.0769937663. The cubic root of 129597209 is about 506.0559664072.

The spelling of 129597209 in words is "one hundred twenty-nine million, five hundred ninety-seven thousand, two hundred nine".