129927173 has 2 divisors, whose sum is σ = 129927174. Its totient is φ = 129927172.

The previous prime is 129927151. The next prime is 129927179. The reversal of 129927173 is 371729921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129914404 + 12769 = 11398^2 + 113^2 .

It is an emirp because it is prime and its reverse (371729921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129927173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129927173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129927179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64963586 + 64963587.

It is an arithmetic number, because the mean of its divisors is an integer number (64963587).

Almost surely, 2^129927173 is an apocalyptic number.

It is an amenable number.

129927173 is a deficient number, since it is larger than the sum of its proper divisors (1).

129927173 is an equidigital number, since it uses as much as digits as its factorization.

129927173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 41.

The square root of 129927173 is about 11398.5601283671. The cubic root of 129927173 is about 506.4850876247.

The spelling of 129927173 in words is "one hundred twenty-nine million, nine hundred twenty-seven thousand, one hundred seventy-three".