197759923997249 has 2 divisors, whose sum is σ = 197759923997250. Its totient is φ = 197759923997248.

The previous prime is 197759923997203. The next prime is 197759923997263. The reversal of 197759923997249 is 942799329957791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181244291290000 + 16515632707249 = 13462700^2 + 4063943^2 .

It is an emirp because it is prime and its reverse (942799329957791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197759923997249 - 2⁸ = 197759923996993 is a prime.

It is not a weakly prime, because it can be changed into another prime (197759923997149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98879961998624 + 98879961998625.

It is an arithmetic number, because the mean of its divisors is an integer number (98879961998625).

Almost surely, 2^{197759923997249} is an apocalyptic number.

It is an amenable number.

197759923997249 is a deficient number, since it is larger than the sum of its proper divisors (1).

197759923997249 is an equidigital number, since it uses as much as digits as its factorization.

197759923997249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43748223120, while the sum is 92.

The spelling of 197759923997249 in words is "one hundred ninety-seven trillion, seven hundred fifty-nine billion, nine hundred twenty-three million, nine hundred ninety-seven thousand, two hundred forty-nine".