129385734889 has 2 divisors, whose sum is σ = 129385734890. Its totient is φ = 129385734888.

The previous prime is 129385734887. The next prime is 129385734917. The reversal of 129385734889 is 988437583921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129258225625 + 127509264 = 359525^2 + 11292^2 .

It is a cyclic number.

It is not a de Polignac number, because 129385734889 - 2¹ = 129385734887 is a prime.

Together with 129385734887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129385734883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64692867444 + 64692867445.

It is an arithmetic number, because the mean of its divisors is an integer number (64692867445).

Almost surely, 2^129385734889 is an apocalyptic number.

It is an amenable number.

129385734889 is a deficient number, since it is larger than the sum of its proper divisors (1).

129385734889 is an equidigital number, since it uses as much as digits as its factorization.

129385734889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104509440, while the sum is 67.

The spelling of 129385734889 in words is "one hundred twenty-nine billion, three hundred eighty-five million, seven hundred thirty-four thousand, eight hundred eighty-nine".