206336521 has 2 divisors, whose sum is σ = 206336522. Its totient is φ = 206336520.

The previous prime is 206336467. The next prime is 206336549. The reversal of 206336521 is 125633602.

It is an a-pointer prime, because the next prime (206336549) can be obtained adding 206336521 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186622921 + 19713600 = 13661^2 + 4440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206336521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206336521.

It is not a weakly prime, because it can be changed into another prime (206330521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103168260 + 103168261.

It is an arithmetic number, because the mean of its divisors is an integer number (103168261).

Almost surely, 2^206336521 is an apocalyptic number.

It is an amenable number.

206336521 is a deficient number, since it is larger than the sum of its proper divisors (1).

206336521 is an equidigital number, since it uses as much as digits as its factorization.

206336521 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 28.

The square root of 206336521 is about 14364.4185750764. The cubic root of 206336521 is about 590.9154809788.

The spelling of 206336521 in words is "two hundred six million, three hundred thirty-six thousand, five hundred twenty-one".