2081305 has 8 divisors (see below), whose sum is σ = 2511432. Its totient is φ = 1655808.

The previous prime is 2081297. The next prime is 2081311. The reversal of 2081305 is 5031802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 143641 + 1937664 = 379^2 + 1392^2 .

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 2081305 - 2³ = 2081297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72 + ... + 2041.

It is an arithmetic number, because the mean of its divisors is an integer number (313929).

2^2081305 is an apocalyptic number.

It is an amenable number.

2081305 is a deficient number, since it is larger than the sum of its proper divisors (430127).

2081305 is a wasteful number, since it uses less digits than its factorization.

2081305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2081305 is about 1442.6728665917. The cubic root of 2081305 is about 127.6767764477.

The spelling of 2081305 in words is "two million, eighty-one thousand, three hundred five".