206559901 has 2 divisors, whose sum is σ = 206559902. Its totient is φ = 206559900.

The previous prime is 206559893. The next prime is 206559907. The reversal of 206559901 is 109955602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206496900 + 63001 = 14370^2 + 251^2 .

It is a cyclic number.

It is not a de Polignac number, because 206559901 - 2³ = 206559893 is a prime.

It is a super-2 number, since 2×206559901² = 85333985402259602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206559907) 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, 103279950 + 103279951.

It is an arithmetic number, because the mean of its divisors is an integer number (103279951).

Almost surely, 2^206559901 is an apocalyptic number.

It is an amenable number.

206559901 is a deficient number, since it is larger than the sum of its proper divisors (1).

206559901 is an equidigital number, since it uses as much as digits as its factorization.

206559901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 206559901 is about 14372.1919344267. The cubic root of 206559901 is about 591.1286458517.

The spelling of 206559901 in words is "two hundred six million, five hundred fifty-nine thousand, nine hundred one".