206516749 has 2 divisors, whose sum is σ = 206516750. Its totient is φ = 206516748.

The previous prime is 206516729. The next prime is 206516753. The reversal of 206516749 is 947615602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108368100 + 98148649 = 10410^2 + 9907^2 .

It is a cyclic number.

It is not a de Polignac number, because 206516749 - 2¹⁹ = 205992461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206516729) 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, 103258374 + 103258375.

It is an arithmetic number, because the mean of its divisors is an integer number (103258375).

Almost surely, 2^206516749 is an apocalyptic number.

It is an amenable number.

206516749 is a deficient number, since it is larger than the sum of its proper divisors (1).

206516749 is an equidigital number, since it uses as much as digits as its factorization.

206516749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 206516749 is about 14370.6906236270. The cubic root of 206516749 is about 591.0874791655.

The spelling of 206516749 in words is "two hundred six million, five hundred sixteen thousand, seven hundred forty-nine".