205740881 has 2 divisors, whose sum is σ = 205740882. Its totient is φ = 205740880.

The previous prime is 205740869. The next prime is 205740923. The reversal of 205740881 is 188047502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128142400 + 77598481 = 11320^2 + 8809^2 .

It is a cyclic number.

It is not a de Polignac number, because 205740881 - 2¹⁰ = 205739857 is a prime.

It is a super-2 number, since 2×205740881² = 84658620229312322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205740841) 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, 102870440 + 102870441.

It is an arithmetic number, because the mean of its divisors is an integer number (102870441).

Almost surely, 2^205740881 is an apocalyptic number.

It is an amenable number.

205740881 is a deficient number, since it is larger than the sum of its proper divisors (1).

205740881 is an equidigital number, since it uses as much as digits as its factorization.

205740881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 205740881 is about 14343.6704159012. The cubic root of 205740881 is about 590.3463264016.

The spelling of 205740881 in words is "two hundred five million, seven hundred forty thousand, eight hundred eighty-one".