129517049 has 2 divisors, whose sum is σ = 129517050. Its totient is φ = 129517048.

The previous prime is 129517027. The next prime is 129517051. The reversal of 129517049 is 940715921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121705024 + 7812025 = 11032^2 + 2795^2 .

It is a cyclic number.

It is not a de Polignac number, because 129517049 - 2²⁴ = 112739833 is a prime.

Together with 129517051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129517009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64758524 + 64758525.

It is an arithmetic number, because the mean of its divisors is an integer number (64758525).

Almost surely, 2^129517049 is an apocalyptic number.

It is an amenable number.

129517049 is a deficient number, since it is larger than the sum of its proper divisors (1).

129517049 is an equidigital number, since it uses as much as digits as its factorization.

129517049 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 129517049 is about 11380.5557421419. Note that the first 3 decimals coincide. The cubic root of 129517049 is about 505.9516076453.

The spelling of 129517049 in words is "one hundred twenty-nine million, five hundred seventeen thousand, forty-nine".