129538361 has 2 divisors, whose sum is σ = 129538362. Its totient is φ = 129538360.

The previous prime is 129538327. The next prime is 129538379. The reversal of 129538361 is 163835921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98624761 + 30913600 = 9931^2 + 5560^2 .

It is a cyclic number.

It is not a de Polignac number, because 129538361 - 2¹⁰ = 129537337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129538391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64769180 + 64769181.

It is an arithmetic number, because the mean of its divisors is an integer number (64769181).

Almost surely, 2^129538361 is an apocalyptic number.

It is an amenable number.

129538361 is a deficient number, since it is larger than the sum of its proper divisors (1).

129538361 is an equidigital number, since it uses as much as digits as its factorization.

129538361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 38.

The square root of 129538361 is about 11381.4920375142. The cubic root of 129538361 is about 505.9793575294.

The spelling of 129538361 in words is "one hundred twenty-nine million, five hundred thirty-eight thousand, three hundred sixty-one".