129116161 has 2 divisors, whose sum is σ = 129116162. Its totient is φ = 129116160.

The previous prime is 129116159. The next prime is 129116171. The reversal of 129116161 is 161611921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80730225 + 48385936 = 8985^2 + 6956^2 .

It is an emirp because it is prime and its reverse (161611921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129116161 - 2¹ = 129116159 is a prime.

Together with 129116159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129116171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64558080 + 64558081.

It is an arithmetic number, because the mean of its divisors is an integer number (64558081).

Almost surely, 2^129116161 is an apocalyptic number.

It is an amenable number.

129116161 is a deficient number, since it is larger than the sum of its proper divisors (1).

129116161 is an equidigital number, since it uses as much as digits as its factorization.

129116161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 28.

The square root of 129116161 is about 11362.9292438174. The cubic root of 129116161 is about 505.4290520945.

The spelling of 129116161 in words is "one hundred twenty-nine million, one hundred sixteen thousand, one hundred sixty-one".