129591729689 has 2 divisors, whose sum is σ = 129591729690. Its totient is φ = 129591729688.

The previous prime is 129591729653. The next prime is 129591729737. The reversal of 129591729689 is 986927195921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77543870089 + 52047859600 = 278467^2 + 228140^2 .

It is an emirp because it is prime and its reverse (986927195921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129591729689 is a prime.

It is not a weakly prime, because it can be changed into another prime (129591729649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64795864844 + 64795864845.

It is an arithmetic number, because the mean of its divisors is an integer number (64795864845).

Almost surely, 2^129591729689 is an apocalyptic number.

It is an amenable number.

129591729689 is a deficient number, since it is larger than the sum of its proper divisors (1).

129591729689 is an equidigital number, since it uses as much as digits as its factorization.

129591729689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44089920, while the sum is 68.

The spelling of 129591729689 in words is "one hundred twenty-nine billion, five hundred ninety-one million, seven hundred twenty-nine thousand, six hundred eighty-nine".