129107549 has 2 divisors, whose sum is σ = 129107550. Its totient is φ = 129107548.

The previous prime is 129107491. The next prime is 129107551. The reversal of 129107549 is 945701921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92987449 + 36120100 = 9643^2 + 6010^2 .

It is a cyclic number.

It is not a de Polignac number, because 129107549 - 2²⁴ = 112330333 is a prime.

Together with 129107551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129107569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64553774 + 64553775.

It is an arithmetic number, because the mean of its divisors is an integer number (64553775).

Almost surely, 2^129107549 is an apocalyptic number.

It is an amenable number.

129107549 is a deficient number, since it is larger than the sum of its proper divisors (1).

129107549 is an equidigital number, since it uses as much as digits as its factorization.

129107549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 129107549 is about 11362.5502859173. The cubic root of 129107549 is about 505.4178145346.

The spelling of 129107549 in words is "one hundred twenty-nine million, one hundred seven thousand, five hundred forty-nine".