129506173 has 2 divisors, whose sum is σ = 129506174. Its totient is φ = 129506172.

The previous prime is 129506171. The next prime is 129506183. The reversal of 129506173 is 371605921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113998329 + 15507844 = 10677^2 + 3938^2 .

It is a cyclic number.

It is not a de Polignac number, because 129506173 - 2¹ = 129506171 is a prime.

Together with 129506171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129506171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64753086 + 64753087.

It is an arithmetic number, because the mean of its divisors is an integer number (64753087).

Almost surely, 2^129506173 is an apocalyptic number.

It is an amenable number.

129506173 is a deficient number, since it is larger than the sum of its proper divisors (1).

129506173 is an equidigital number, since it uses as much as digits as its factorization.

129506173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 129506173 is about 11380.0778995576. The cubic root of 129506173 is about 505.9374450730.

The spelling of 129506173 in words is "one hundred twenty-nine million, five hundred six thousand, one hundred seventy-three".