206155193 has 2 divisors, whose sum is σ = 206155194. Its totient is φ = 206155192.

The previous prime is 206155109. The next prime is 206155211. The reversal of 206155193 is 391551602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154430329 + 51724864 = 12427^2 + 7192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206155193 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (206155393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103077596 + 103077597.

It is an arithmetic number, because the mean of its divisors is an integer number (103077597).

Almost surely, 2^206155193 is an apocalyptic number.

It is an amenable number.

206155193 is a deficient number, since it is larger than the sum of its proper divisors (1).

206155193 is an equidigital number, since it uses as much as digits as its factorization.

206155193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 206155193 is about 14358.1054808773. The cubic root of 206155193 is about 590.7423319167.

The spelling of 206155193 in words is "two hundred six million, one hundred fifty-five thousand, one hundred ninety-three".