189999788129 has 2 divisors, whose sum is σ = 189999788130. Its totient is φ = 189999788128.

The previous prime is 189999788117. The next prime is 189999788149. The reversal of 189999788129 is 921887999981.

189999788129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134292931600 + 55706856529 = 366460^2 + 236023^2 .

It is a cyclic number.

It is not a de Polignac number, because 189999788129 - 2¹² = 189999784033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (189999788149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94999894064 + 94999894065.

It is an arithmetic number, because the mean of its divisors is an integer number (94999894065).

Almost surely, 2^189999788129 is an apocalyptic number.

It is an amenable number.

189999788129 is a deficient number, since it is larger than the sum of its proper divisors (1).

189999788129 is an equidigital number, since it uses as much as digits as its factorization.

189999788129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423263232, while the sum is 80.

The spelling of 189999788129 in words is "one hundred eighty-nine billion, nine hundred ninety-nine million, seven hundred eighty-eight thousand, one hundred twenty-nine".