71243912197 has 2 divisors, whose sum is σ = 71243912198. Its totient is φ = 71243912196.

The previous prime is 71243912189. The next prime is 71243912261. The reversal of 71243912197 is 79121934217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70791116356 + 452795841 = 266066^2 + 21279^2 .

It is an emirp because it is prime and its reverse (79121934217) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71243912197 - 2³ = 71243912189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71243912107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35621956098 + 35621956099.

It is an arithmetic number, because the mean of its divisors is an integer number (35621956099).

Almost surely, 2^71243912197 is an apocalyptic number.

It is an amenable number.

71243912197 is a deficient number, since it is larger than the sum of its proper divisors (1).

71243912197 is an equidigital number, since it uses as much as digits as its factorization.

71243912197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The spelling of 71243912197 in words is "seventy-one billion, two hundred forty-three million, nine hundred twelve thousand, one hundred ninety-seven".