129267121 has 2 divisors, whose sum is σ = 129267122. Its totient is φ = 129267120.

The previous prime is 129267119. The next prime is 129267161. The reversal of 129267121 is 121762921.

129267121 = 8039² + 8040².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64641600 + 64625521 = 8040^2 + 8039^2 .

It is a cyclic number.

It is not a de Polignac number, because 129267121 - 2¹ = 129267119 is a prime.

Together with 129267119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129267101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64633560 + 64633561.

It is an arithmetic number, because the mean of its divisors is an integer number (64633561).

Almost surely, 2^129267121 is an apocalyptic number.

129267121 is the 8040-th centered square number.

It is an amenable number.

129267121 is a deficient number, since it is larger than the sum of its proper divisors (1).

129267121 is an equidigital number, since it uses as much as digits as its factorization.

129267121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 129267121 is about 11369.5699566870. The cubic root of 129267121 is about 505.6259545128.

The spelling of 129267121 in words is "one hundred twenty-nine million, two hundred sixty-seven thousand, one hundred twenty-one".