197206609 has 2 divisors, whose sum is σ = 197206610. Its totient is φ = 197206608.

The previous prime is 197206573. The next prime is 197206621. The reversal of 197206609 is 906602791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192432384 + 4774225 = 13872^2 + 2185^2 .

It is a cyclic number.

It is not a de Polignac number, because 197206609 - 2¹⁵ = 197173841 is a prime.

It is not a weakly prime, because it can be changed into another prime (197206649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98603304 + 98603305.

It is an arithmetic number, because the mean of its divisors is an integer number (98603305).

Almost surely, 2^197206609 is an apocalyptic number.

It is an amenable number.

197206609 is a deficient number, since it is larger than the sum of its proper divisors (1).

197206609 is an equidigital number, since it uses as much as digits as its factorization.

197206609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 197206609 is about 14043.0270597190. The cubic root of 197206609 is about 582.0681310792.

The spelling of 197206609 in words is "one hundred ninety-seven million, two hundred six thousand, six hundred nine".