71243912189 has 2 divisors, whose sum is σ = 71243912190. Its totient is φ = 71243912188.

The previous prime is 71243912147. The next prime is 71243912197. The reversal of 71243912189 is 98121934217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41013135289 + 30230776900 = 202517^2 + 173870^2 .

It is a cyclic number.

It is not a de Polignac number, because 71243912189 - 2³⁶ = 2524435453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71243915189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35621956094 + 35621956095.

It is an arithmetic number, because the mean of its divisors is an integer number (35621956095).

Almost surely, 2^71243912189 is an apocalyptic number.

It is an amenable number.

71243912189 is a deficient number, since it is larger than the sum of its proper divisors (1).

71243912189 is an equidigital number, since it uses as much as digits as its factorization.

71243912189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 47.

The spelling of 71243912189 in words is "seventy-one billion, two hundred forty-three million, nine hundred twelve thousand, one hundred eighty-nine".