206513149 has 2 divisors, whose sum is σ = 206513150. Its totient is φ = 206513148.

The previous prime is 206513143. The next prime is 206513173. The reversal of 206513149 is 941315602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187197124 + 19316025 = 13682^2 + 4395^2 .

It is a cyclic number.

It is not a de Polignac number, because 206513149 - 2¹¹ = 206511101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206513149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206513143) 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, 103256574 + 103256575.

It is an arithmetic number, because the mean of its divisors is an integer number (103256575).

Almost surely, 2^206513149 is an apocalyptic number.

It is an amenable number.

206513149 is a deficient number, since it is larger than the sum of its proper divisors (1).

206513149 is an equidigital number, since it uses as much as digits as its factorization.

206513149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 206513149 is about 14370.5653681405. The cubic root of 206513149 is about 591.0840445332.

The spelling of 206513149 in words is "two hundred six million, five hundred thirteen thousand, one hundred forty-nine".