129668173 has 4 divisors (see below), whose sum is σ = 129692988. Its totient is φ = 129643360.

The previous prime is 129668153. The next prime is 129668183. The reversal of 129668173 is 371866921.

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 55398249 + 74269924 = 7443^2 + 8618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129668173 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 (129668113) 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, 1186 + ... + 16147.

It is an arithmetic number, because the mean of its divisors is an integer number (32423247).

Almost surely, 2^129668173 is an apocalyptic number.

It is an amenable number.

129668173 is a deficient number, since it is larger than the sum of its proper divisors (24815).

129668173 is an equidigital number, since it uses as much as digits as its factorization.

129668173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24814.

The product of its digits is 108864, while the sum is 43.

The square root of 129668173 is about 11387.1933767720. The cubic root of 129668173 is about 506.1483171687.

The spelling of 129668173 in words is "one hundred twenty-nine million, six hundred sixty-eight thousand, one hundred seventy-three".