197845243 has 2 divisors, whose sum is σ = 197845244. Its totient is φ = 197845242.

The previous prime is 197845223. The next prime is 197845261. The reversal of 197845243 is 342548791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197845243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197845243.

It is not a weakly prime, because it can be changed into another prime (197845223) 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, 98922621 + 98922622.

It is an arithmetic number, because the mean of its divisors is an integer number (98922622).

Almost surely, 2^197845243 is an apocalyptic number.

197845243 is a deficient number, since it is larger than the sum of its proper divisors (1).

197845243 is an equidigital number, since it uses as much as digits as its factorization.

197845243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 197845243 is about 14065.7471539908. The cubic root of 197845243 is about 582.6957773034.

The spelling of 197845243 in words is "one hundred ninety-seven million, eight hundred forty-five thousand, two hundred forty-three".