2105801 has 4 divisors (see below), whose sum is σ = 2157204. Its totient is φ = 2054400.

The previous prime is 2105767. The next prime is 2105809. The reversal of 2105801 is 1085012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89401 + 2016400 = 299^2 + 1420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2105801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2105801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2105809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25640 + ... + 25721.

It is an arithmetic number, because the mean of its divisors is an integer number (539301).

2^2105801 is an apocalyptic number.

It is an amenable number.

2105801 is a deficient number, since it is larger than the sum of its proper divisors (51403).

2105801 is an equidigital number, since it uses as much as digits as its factorization.

2105801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51402.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2105801 is about 1451.1378294290. The cubic root of 2105801 is about 128.1757230062.

The spelling of 2105801 in words is "two million, one hundred five thousand, eight hundred one".