205443197 has 2 divisors, whose sum is σ = 205443198. Its totient is φ = 205443196.

The previous prime is 205443193. The next prime is 205443247. The reversal of 205443197 is 791344502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198415396 + 7027801 = 14086^2 + 2651^2 .

It is a cyclic number.

It is not a de Polignac number, because 205443197 - 2² = 205443193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205443193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102721598 + 102721599.

It is an arithmetic number, because the mean of its divisors is an integer number (102721599).

Almost surely, 2^205443197 is an apocalyptic number.

It is an amenable number.

205443197 is a deficient number, since it is larger than the sum of its proper divisors (1).

205443197 is an equidigital number, since it uses as much as digits as its factorization.

205443197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 205443197 is about 14333.2898177634. The cubic root of 205443197 is about 590.0614673104.

Adding to 205443197 its reverse (791344502), we get a palindrome (996787699).

The spelling of 205443197 in words is "two hundred five million, four hundred forty-three thousand, one hundred ninety-seven".