206513143 has 2 divisors, whose sum is σ = 206513144. Its totient is φ = 206513142.

The previous prime is 206513107. The next prime is 206513149. The reversal of 206513143 is 341315602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 206513143 - 2¹³ = 206504951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206513149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103256571 + 103256572.

It is an arithmetic number, because the mean of its divisors is an integer number (103256572).

Almost surely, 2^206513143 is an apocalyptic number.

206513143 is a deficient number, since it is larger than the sum of its proper divisors (1).

206513143 is an equidigital number, since it uses as much as digits as its factorization.

206513143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 206513143 is about 14370.5651593805. The cubic root of 206513143 is about 591.0840388088.

Adding to 206513143 its reverse (341315602), we get a palindrome (547828745).

The spelling of 206513143 in words is "two hundred six million, five hundred thirteen thousand, one hundred forty-three".