129200261 has 2 divisors, whose sum is σ = 129200262. Its totient is φ = 129200260.

The previous prime is 129200243. The next prime is 129200287. The reversal of 129200261 is 162002921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76912900 + 52287361 = 8770^2 + 7231^2 .

It is an emirp because it is prime and its reverse (162002921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129200261 - 2¹⁰ = 129199237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129200161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64600130 + 64600131.

It is an arithmetic number, because the mean of its divisors is an integer number (64600131).

Almost surely, 2^129200261 is an apocalyptic number.

It is an amenable number.

129200261 is a deficient number, since it is larger than the sum of its proper divisors (1).

129200261 is an equidigital number, since it uses as much as digits as its factorization.

129200261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 129200261 is about 11366.6292716882. The cubic root of 129200261 is about 505.5387655943.

The spelling of 129200261 in words is "one hundred twenty-nine million, two hundred thousand, two hundred sixty-one".