206512057 has 2 divisors, whose sum is σ = 206512058. Its totient is φ = 206512056.

The previous prime is 206512043. The next prime is 206512067. The reversal of 206512057 is 750215602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197655481 + 8856576 = 14059^2 + 2976^2 .

It is a cyclic number.

It is not a de Polignac number, because 206512057 - 2¹¹ = 206510009 is a prime.

It is not a weakly prime, because it can be changed into another prime (206512067) 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, 103256028 + 103256029.

It is an arithmetic number, because the mean of its divisors is an integer number (103256029).

Almost surely, 2^206512057 is an apocalyptic number.

It is an amenable number.

206512057 is a deficient number, since it is larger than the sum of its proper divisors (1).

206512057 is an equidigital number, since it uses as much as digits as its factorization.

206512057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 206512057 is about 14370.5273737605. The cubic root of 206512057 is about 591.0830026869.

Adding to 206512057 its reverse (750215602), we get a palindrome (956727659).

The spelling of 206512057 in words is "two hundred six million, five hundred twelve thousand, fifty-seven".