197963609 has 2 divisors, whose sum is σ = 197963610. Its totient is φ = 197963608.

The previous prime is 197963593. The next prime is 197963617. The reversal of 197963609 is 906369791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129322384 + 68641225 = 11372^2 + 8285^2 .

It is an emirp because it is prime and its reverse (906369791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197963609 - 2⁴ = 197963593 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (197963699) 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, 98981804 + 98981805.

It is an arithmetic number, because the mean of its divisors is an integer number (98981805).

Almost surely, 2^197963609 is an apocalyptic number.

It is an amenable number.

197963609 is a deficient number, since it is larger than the sum of its proper divisors (1).

197963609 is an equidigital number, since it uses as much as digits as its factorization.

197963609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 197963609 is about 14069.9541221711. The cubic root of 197963609 is about 582.8119583772.

The spelling of 197963609 in words is "one hundred ninety-seven million, nine hundred sixty-three thousand, six hundred nine".