189173887447 has 2 divisors, whose sum is σ = 189173887448. Its totient is φ = 189173887446.

The previous prime is 189173887333. The next prime is 189173887457. The reversal of 189173887447 is 744788371981.

189173887447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189173887447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189173887457) 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, 94586943723 + 94586943724.

It is an arithmetic number, because the mean of its divisors is an integer number (94586943724).

Almost surely, 2^189173887447 is an apocalyptic number.

189173887447 is a deficient number, since it is larger than the sum of its proper divisors (1).

189173887447 is an equidigital number, since it uses as much as digits as its factorization.

189173887447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75866112, while the sum is 67.

The spelling of 189173887447 in words is "one hundred eighty-nine billion, one hundred seventy-three million, eight hundred eighty-seven thousand, four hundred forty-seven".