2105791805 has 8 divisors (see below), whose sum is σ = 2721331032. Its totient is φ = 1555046208.

The previous prime is 2105791781. The next prime is 2105791861. The reversal of 2105791805 is 5081975012.

It can be written as a sum of positive squares in 4 ways, for example, as 83850649 + 2021941156 = 9157^2 + 44966^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2105791805 - 2⁶ = 2105791741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16198334 + ... + 16198463.

It is an arithmetic number, because the mean of its divisors is an integer number (340166379).

Almost surely, 2^2105791805 is an apocalyptic number.

It is an amenable number.

2105791805 is a deficient number, since it is larger than the sum of its proper divisors (615539227).

2105791805 is a wasteful number, since it uses less digits than its factorization.

2105791805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32396815.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 2105791805 is about 45888.9072107846. The cubic root of 2105791805 is about 1281.7553644577.

The spelling of 2105791805 in words is "two billion, one hundred five million, seven hundred ninety-one thousand, eight hundred five".