129807173 has 2 divisors, whose sum is σ = 129807174. Its totient is φ = 129807172.

The previous prime is 129807163. The next prime is 129807187. The reversal of 129807173 is 371708921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129800449 + 6724 = 11393^2 + 82^2 .

It is a cyclic number.

It is not a de Polignac number, because 129807173 - 2⁶ = 129807109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129807133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64903586 + 64903587.

It is an arithmetic number, because the mean of its divisors is an integer number (64903587).

Almost surely, 2^129807173 is an apocalyptic number.

It is an amenable number.

129807173 is a deficient number, since it is larger than the sum of its proper divisors (1).

129807173 is an equidigital number, since it uses as much as digits as its factorization.

129807173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 129807173 is about 11393.2950896569. The cubic root of 129807173 is about 506.3291106771.

The spelling of 129807173 in words is "one hundred twenty-nine million, eight hundred seven thousand, one hundred seventy-three".