129029812189 has 2 divisors, whose sum is σ = 129029812190. Its totient is φ = 129029812188.

The previous prime is 129029812187. The next prime is 129029812237. The reversal of 129029812189 is 981218920921.

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., 128446976025 + 582836164 = 358395^2 + 24142^2 .

It is a cyclic number.

It is not a de Polignac number, because 129029812189 - 2¹ = 129029812187 is a prime.

It is a super-2 number, since 2×129029812189² (a number of 23 digits) contains 22 as substring.

Together with 129029812187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129029812187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64514906094 + 64514906095.

It is an arithmetic number, because the mean of its divisors is an integer number (64514906095).

Almost surely, 2^129029812189 is an apocalyptic number.

It is an amenable number.

129029812189 is a deficient number, since it is larger than the sum of its proper divisors (1).

129029812189 is an equidigital number, since it uses as much as digits as its factorization.

129029812189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 52.

The spelling of 129029812189 in words is "one hundred twenty-nine billion, twenty-nine million, eight hundred twelve thousand, one hundred eighty-nine".