197975846489 has 2 divisors, whose sum is σ = 197975846490. Its totient is φ = 197975846488.

The previous prime is 197975846443. The next prime is 197975846531. The reversal of 197975846489 is 984648579791.

It is a happy number.

197975846489 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 can be written as a sum of positive squares in only one way, i.e., 196585824400 + 1390022089 = 443380^2 + 37283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197975846489 is a prime.

It is not a weakly prime, because it can be changed into another prime (197975846389) 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, 98987923244 + 98987923245.

It is an arithmetic number, because the mean of its divisors is an integer number (98987923245).

Almost surely, 2^197975846489 is an apocalyptic number.

It is an amenable number.

197975846489 is a deficient number, since it is larger than the sum of its proper divisors (1).

197975846489 is an equidigital number, since it uses as much as digits as its factorization.

197975846489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1097349120, while the sum is 77.

The spelling of 197975846489 in words is "one hundred ninety-seven billion, nine hundred seventy-five million, eight hundred forty-six thousand, four hundred eighty-nine".