129643769 has 2 divisors, whose sum is σ = 129643770. Its totient is φ = 129643768.

The previous prime is 129643741. The next prime is 129643817. The reversal of 129643769 is 967346921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83905600 + 45738169 = 9160^2 + 6763^2 .

It is a cyclic number.

It is not a de Polignac number, because 129643769 - 2¹² = 129639673 is a prime.

It is a super-2 number, since 2×129643769² = 33615013681050722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (120643769) 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, 64821884 + 64821885.

It is an arithmetic number, because the mean of its divisors is an integer number (64821885).

Almost surely, 2^129643769 is an apocalyptic number.

It is an amenable number.

129643769 is a deficient number, since it is larger than the sum of its proper divisors (1).

129643769 is an equidigital number, since it uses as much as digits as its factorization.

129643769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 129643769 is about 11386.1217717008. The cubic root of 129643769 is about 506.1165622201.

The spelling of 129643769 in words is "one hundred twenty-nine million, six hundred forty-three thousand, seven hundred sixty-nine".