129755281 has 2 divisors, whose sum is σ = 129755282. Its totient is φ = 129755280.

The previous prime is 129755279. The next prime is 129755317. The reversal of 129755281 is 182557921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129754881 + 400 = 11391^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 129755281 - 2¹ = 129755279 is a prime.

It is a super-2 number, since 2×129755281² = 33672865894777922, which contains 22 as substring.

Together with 129755279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129755231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64877640 + 64877641.

It is an arithmetic number, because the mean of its divisors is an integer number (64877641).

Almost surely, 2^129755281 is an apocalyptic number.

It is an amenable number.

129755281 is a deficient number, since it is larger than the sum of its proper divisors (1).

129755281 is an equidigital number, since it uses as much as digits as its factorization.

129755281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 40.

The square root of 129755281 is about 11391.0175577075. The cubic root of 129755281 is about 506.2616312727.

The spelling of 129755281 in words is "one hundred twenty-nine million, seven hundred fifty-five thousand, two hundred eighty-one".