129747929 has 2 divisors, whose sum is σ = 129747930. Its totient is φ = 129747928.

The previous prime is 129747923. The next prime is 129747949. The reversal of 129747929 is 929747921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128210329 + 1537600 = 11323^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 129747929 - 2⁴ = 129747913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129747923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64873964 + 64873965.

It is an arithmetic number, because the mean of its divisors is an integer number (64873965).

Almost surely, 2^129747929 is an apocalyptic number.

It is an amenable number.

129747929 is a deficient number, since it is larger than the sum of its proper divisors (1).

129747929 is an equidigital number, since it uses as much as digits as its factorization.

129747929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 50.

The square root of 129747929 is about 11390.6948427214. The cubic root of 129747929 is about 506.2520694119.

The spelling of 129747929 in words is "one hundred twenty-nine million, seven hundred forty-seven thousand, nine hundred twenty-nine".