205679197 has 2 divisors, whose sum is σ = 205679198. Its totient is φ = 205679196.

The previous prime is 205679183. The next prime is 205679207. The reversal of 205679197 is 791976502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180338041 + 25341156 = 13429^2 + 5034^2 .

It is a cyclic number.

It is not a de Polignac number, because 205679197 - 2⁷ = 205679069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205679137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102839598 + 102839599.

It is an arithmetic number, because the mean of its divisors is an integer number (102839599).

Almost surely, 2^205679197 is an apocalyptic number.

It is an amenable number.

205679197 is a deficient number, since it is larger than the sum of its proper divisors (1).

205679197 is an equidigital number, since it uses as much as digits as its factorization.

205679197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 46.

The square root of 205679197 is about 14341.5200379876. The cubic root of 205679197 is about 590.2873224699.

The spelling of 205679197 in words is "two hundred five million, six hundred seventy-nine thousand, one hundred ninety-seven".