2005081 has 8 divisors (see below), whose sum is σ = 2184840. Its totient is φ = 1828992.

The previous prime is 2005079. The next prime is 2005103. The reversal of 2005081 is 1805002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25 + 2005056 = 5^2 + 1416^2 .

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 2005081 - 2¹ = 2005079 is a prime.

It is a super-2 number, since 2×2005081² = 8040699633122, which contains 22 as substring.

It is a Duffinian number.

2005081 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2005001) by changing a digit.

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, 291 + ... + 2023.

It is an arithmetic number, because the mean of its divisors is an integer number (273105).

2^2005081 is an apocalyptic number.

It is an amenable number.

2005081 is a deficient number, since it is larger than the sum of its proper divisors (179759).

2005081 is a wasteful number, since it uses less digits than its factorization.

2005081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1835.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 2005081 is about 1416.0088276561. The cubic root of 2005081 is about 126.0987090787.

The spelling of 2005081 in words is "two million, five thousand, eighty-one".