129907121 has 2 divisors, whose sum is σ = 129907122. Its totient is φ = 129907120.

The previous prime is 129907103. The next prime is 129907133. The reversal of 129907121 is 121709921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127690000 + 2217121 = 11300^2 + 1489^2 .

It is an emirp because it is prime and its reverse (121709921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129907121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129907021) 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, 64953560 + 64953561.

It is an arithmetic number, because the mean of its divisors is an integer number (64953561).

Almost surely, 2^129907121 is an apocalyptic number.

It is an amenable number.

129907121 is a deficient number, since it is larger than the sum of its proper divisors (1).

129907121 is an equidigital number, since it uses as much as digits as its factorization.

129907121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 129907121 is about 11397.6805096476. The cubic root of 129907121 is about 506.4590305620.

The spelling of 129907121 in words is "one hundred twenty-nine million, nine hundred seven thousand, one hundred twenty-one".