129823171 has 2 divisors, whose sum is σ = 129823172. Its totient is φ = 129823170.

The previous prime is 129823139. The next prime is 129823193. The reversal of 129823171 is 171328921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129823171 - 2⁵ = 129823139 is a prime.

It is not a weakly prime, because it can be changed into another prime (129823471) 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, 64911585 + 64911586.

It is an arithmetic number, because the mean of its divisors is an integer number (64911586).

Almost surely, 2^129823171 is an apocalyptic number.

129823171 is a deficient number, since it is larger than the sum of its proper divisors (1).

129823171 is an equidigital number, since it uses as much as digits as its factorization.

129823171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 129823171 is about 11393.9971476212. The cubic root of 129823171 is about 506.3499105558.

The spelling of 129823171 in words is "one hundred twenty-nine million, eight hundred twenty-three thousand, one hundred seventy-one".