129760261 has 2 divisors, whose sum is σ = 129760262. Its totient is φ = 129760260.

The previous prime is 129760259. The next prime is 129760277. The reversal of 129760261 is 162067921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114597025 + 15163236 = 10705^2 + 3894^2 .

It is a cyclic number.

It is not a de Polignac number, because 129760261 - 2¹ = 129760259 is a prime.

Together with 129760259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129760231) 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, 64880130 + 64880131.

It is an arithmetic number, because the mean of its divisors is an integer number (64880131).

Almost surely, 2^129760261 is an apocalyptic number.

It is an amenable number.

129760261 is a deficient number, since it is larger than the sum of its proper divisors (1).

129760261 is an equidigital number, since it uses as much as digits as its factorization.

129760261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 129760261 is about 11391.2361488997. The cubic root of 129760261 is about 506.2681079536.

The spelling of 129760261 in words is "one hundred twenty-nine million, seven hundred sixty thousand, two hundred sixty-one".