197707609109 has 2 divisors, whose sum is σ = 197707609110. Its totient is φ = 197707609108.

The previous prime is 197707609093. The next prime is 197707609129. The reversal of 197707609109 is 901906707791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197044546609 + 663062500 = 443897^2 + 25750^2 .

It is a cyclic number.

It is not a de Polignac number, because 197707609109 - 2⁴ = 197707609093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197707609129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98853804554 + 98853804555.

It is an arithmetic number, because the mean of its divisors is an integer number (98853804555).

Almost surely, 2^197707609109 is an apocalyptic number.

It is an amenable number.

197707609109 is a deficient number, since it is larger than the sum of its proper divisors (1).

197707609109 is an equidigital number, since it uses as much as digits as its factorization.

197707609109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500282, while the sum is 56.

The spelling of 197707609109 in words is "one hundred ninety-seven billion, seven hundred seven million, six hundred nine thousand, one hundred nine".