129027709609 has 2 divisors, whose sum is σ = 129027709610. Its totient is φ = 129027709608.

The previous prime is 129027709553. The next prime is 129027709639. The reversal of 129027709609 is 906907720921.

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., 128555951209 + 471758400 = 358547^2 + 21720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129027709609 is a prime.

It is not a weakly prime, because it can be changed into another prime (129027709639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64513854804 + 64513854805.

It is an arithmetic number, because the mean of its divisors is an integer number (64513854805).

Almost surely, 2^129027709609 is an apocalyptic number.

It is an amenable number.

129027709609 is a deficient number, since it is larger than the sum of its proper divisors (1).

129027709609 is an equidigital number, since it uses as much as digits as its factorization.

129027709609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 857304, while the sum is 52.

The spelling of 129027709609 in words is "one hundred twenty-nine billion, twenty-seven million, seven hundred nine thousand, six hundred nine".