2105543505 has 32 divisors (see below), whose sum is σ = 3654161280. Its totient is φ = 1029104640.

The previous prime is 2105543437. The next prime is 2105543507. The reversal of 2105543505 is 5053455012.

It is a happy number.

It is not a de Polignac number, because 2105543505 - 2⁸ = 2105543249 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2105543507) 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 in 31 ways as a sum of consecutive naturals, for example, 11736 + ... + 65945.

It is an arithmetic number, because the mean of its divisors is an integer number (114192540).

Almost surely, 2^2105543505 is an apocalyptic number.

It is an amenable number.

2105543505 is a deficient number, since it is larger than the sum of its proper divisors (1548617775).

2105543505 is a wasteful number, since it uses less digits than its factorization.

2105543505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77841.

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 2105543505 is about 45886.2016841665. The cubic root of 2105543505 is about 1281.7049839838.

Adding to 2105543505 its reverse (5053455012), we get a palindrome (7158998517).

The spelling of 2105543505 in words is "two billion, one hundred five million, five hundred forty-three thousand, five hundred five".