197509939241 has 2 divisors, whose sum is σ = 197509939242. Its totient is φ = 197509939240.

The previous prime is 197509939199. The next prime is 197509939267. The reversal of 197509939241 is 142939905791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104177245225 + 93332694016 = 322765^2 + 305504^2 .

It is a cyclic number.

It is not a de Polignac number, because 197509939241 - 2³⁴ = 180330070057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (197509939741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98754969620 + 98754969621.

It is an arithmetic number, because the mean of its divisors is an integer number (98754969621).

Almost surely, 2^197509939241 is an apocalyptic number.

It is an amenable number.

197509939241 is a deficient number, since it is larger than the sum of its proper divisors (1).

197509939241 is an equidigital number, since it uses as much as digits as its factorization.

197509939241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5511240, while the sum is 59.

The spelling of 197509939241 in words is "one hundred ninety-seven billion, five hundred nine million, nine hundred thirty-nine thousand, two hundred forty-one".