129537709 has 8 divisors (see below), whose sum is σ = 150470528. Its totient is φ = 109211760.

The previous prime is 129537701. The next prime is 129537719. The reversal of 129537709 is 907735921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129537709 - 2³ = 129537701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129537701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151257 + ... + 152110.

It is an arithmetic number, because the mean of its divisors is an integer number (18808816).

Almost surely, 2^129537709 is an apocalyptic number.

It is an amenable number.

129537709 is a deficient number, since it is larger than the sum of its proper divisors (20932819).

129537709 is an equidigital number, since it uses as much as digits as its factorization.

129537709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303435.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 129537709 is about 11381.4633944849. The cubic root of 129537709 is about 505.9785086197.

The spelling of 129537709 in words is "one hundred twenty-nine million, five hundred thirty-seven thousand, seven hundred nine".