129032665 has 4 divisors (see below), whose sum is σ = 154839204. Its totient is φ = 103226128.

The previous prime is 129032663. The next prime is 129032677. The reversal of 129032665 is 566230921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100260169 + 28772496 = 10013^2 + 5364^2 .

It is a cyclic number.

It is not a de Polignac number, because 129032665 - 2¹ = 129032663 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 129032665.

It is not an unprimeable number, because it can be changed into a prime (129032663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12903262 + ... + 12903271.

It is an arithmetic number, because the mean of its divisors is an integer number (38709801).

Almost surely, 2^129032665 is an apocalyptic number.

It is an amenable number.

129032665 is a deficient number, since it is larger than the sum of its proper divisors (25806539).

129032665 is an equidigital number, since it uses as much as digits as its factorization.

129032665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25806538.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 129032665 is about 11359.2545970235. The cubic root of 129032665 is about 505.3200794095.

The spelling of 129032665 in words is "one hundred twenty-nine million, thirty-two thousand, six hundred sixty-five".