206665241 has 2 divisors, whose sum is σ = 206665242. Its totient is φ = 206665240.

The previous prime is 206665229. The next prime is 206665279. The reversal of 206665241 is 142566602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178997641 + 27667600 = 13379^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 206665241 - 2²² = 202470937 is a prime.

It is equal to p_11427377 and since 206665241 and 11427377 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 206665198 and 206665207.

It is not a weakly prime, because it can be changed into another prime (206665211) 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, 103332620 + 103332621.

It is an arithmetic number, because the mean of its divisors is an integer number (103332621).

Almost surely, 2^206665241 is an apocalyptic number.

It is an amenable number.

206665241 is a deficient number, since it is larger than the sum of its proper divisors (1).

206665241 is an equidigital number, since it uses as much as digits as its factorization.

206665241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 206665241 is about 14375.8561831983. The cubic root of 206665241 is about 591.2291153507.

The spelling of 206665241 in words is "two hundred six million, six hundred sixty-five thousand, two hundred forty-one".