206059561 has 2 divisors, whose sum is σ = 206059562. Its totient is φ = 206059560.

The previous prime is 206059531. The next prime is 206059589. The reversal of 206059561 is 165950602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120033936 + 86025625 = 10956^2 + 9275^2 .

It is a cyclic number.

It is not a de Polignac number, because 206059561 - 2⁷ = 206059433 is a prime.

It is equal to p_11395744 and since 206059561 and 11395744 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (206059501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103029780 + 103029781.

It is an arithmetic number, because the mean of its divisors is an integer number (103029781).

Almost surely, 2^206059561 is an apocalyptic number.

It is an amenable number.

206059561 is a deficient number, since it is larger than the sum of its proper divisors (1).

206059561 is an equidigital number, since it uses as much as digits as its factorization.

206059561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 206059561 is about 14354.7748502023. The cubic root of 206059561 is about 590.6509725745.

The spelling of 206059561 in words is "two hundred six million, fifty-nine thousand, five hundred sixty-one".