205960861 has 2 divisors, whose sum is σ = 205960862. Its totient is φ = 205960860.

The previous prime is 205960739. The next prime is 205960877. The reversal of 205960861 is 168069502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189200025 + 16760836 = 13755^2 + 4094^2 .

It is a cyclic number.

It is not a de Polignac number, because 205960861 - 2¹⁹ = 205436573 is a prime.

It is a super-2 number, since 2×205960861² = 84839752527722642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 205960861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205960961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102980430 + 102980431.

It is an arithmetic number, because the mean of its divisors is an integer number (102980431).

Almost surely, 2^205960861 is an apocalyptic number.

It is an amenable number.

205960861 is a deficient number, since it is larger than the sum of its proper divisors (1).

205960861 is an equidigital number, since it uses as much as digits as its factorization.

205960861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 205960861 is about 14351.3365579656. The cubic root of 205960861 is about 590.5566526587.

The spelling of 205960861 in words is "two hundred five million, nine hundred sixty thousand, eight hundred sixty-one".