206111197 has 2 divisors, whose sum is σ = 206111198. Its totient is φ = 206111196.

The previous prime is 206111189. The next prime is 206111203. The reversal of 206111197 is 791111602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118613881 + 87497316 = 10891^2 + 9354^2 .

It is a cyclic number.

It is not a de Polignac number, because 206111197 - 2³ = 206111189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206111167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103055598 + 103055599.

It is an arithmetic number, because the mean of its divisors is an integer number (103055599).

Almost surely, 2^206111197 is an apocalyptic number.

It is an amenable number.

206111197 is a deficient number, since it is larger than the sum of its proper divisors (1).

206111197 is an equidigital number, since it uses as much as digits as its factorization.

206111197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 206111197 is about 14356.5733028463. The cubic root of 206111197 is about 590.7003050851.

Adding to 206111197 its reverse (791111602), we get a palindrome (997222799).

The spelling of 206111197 in words is "two hundred six million, one hundred eleven thousand, one hundred ninety-seven".