206513191 has 2 divisors, whose sum is σ = 206513192. Its totient is φ = 206513190.

The previous prime is 206513179. The next prime is 206513201. The reversal of 206513191 is 191315602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206513191 - 2¹⁵ = 206480423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206513491) 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, 103256595 + 103256596.

It is an arithmetic number, because the mean of its divisors is an integer number (103256596).

Almost surely, 2^206513191 is an apocalyptic number.

206513191 is a deficient number, since it is larger than the sum of its proper divisors (1).

206513191 is an equidigital number, since it uses as much as digits as its factorization.

206513191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 206513191 is about 14370.5668294608. The cubic root of 206513191 is about 591.0840846042.

Adding to 206513191 its reverse (191315602), we get a palindrome (397828793).

The spelling of 206513191 in words is "two hundred six million, five hundred thirteen thousand, one hundred ninety-one".