129327917 has 2 divisors, whose sum is σ = 129327918. Its totient is φ = 129327916.

The previous prime is 129327841. The next prime is 129327923. The reversal of 129327917 is 719723921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115047076 + 14280841 = 10726^2 + 3779^2 .

It is a cyclic number.

It is not a de Polignac number, because 129327917 - 2¹⁸ = 129065773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129327967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64663958 + 64663959.

It is an arithmetic number, because the mean of its divisors is an integer number (64663959).

Almost surely, 2^129327917 is an apocalyptic number.

It is an amenable number.

129327917 is a deficient number, since it is larger than the sum of its proper divisors (1).

129327917 is an equidigital number, since it uses as much as digits as its factorization.

129327917 is an evil number, because the sum of its binary digits is even.

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

The square root of 129327917 is about 11372.2432703491. The cubic root of 129327917 is about 505.7052095660.

The spelling of 129327917 in words is "one hundred twenty-nine million, three hundred twenty-seven thousand, nine hundred seventeen".