2011081 has 2 divisors, whose sum is σ = 2011082. Its totient is φ = 2011080.

The previous prime is 2011073. The next prime is 2011099. The reversal of 2011081 is 1801102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1245456 + 765625 = 1116^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011081 - 2³ = 2011073 is a prime.

It is a super-3 number, since 3×2011081³ = 24401130275958133323, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (2011021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005540 + 1005541.

It is an arithmetic number, because the mean of its divisors is an integer number (1005541).

2^2011081 is an apocalyptic number.

It is an amenable number.

2011081 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011081 is an equidigital number, since it uses as much as digits as its factorization.

2011081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2011081 is about 1418.1258759363. The cubic root of 2011081 is about 126.2243629936.

Adding to 2011081 its reverse (1801102), we get a palindrome (3812183).

The spelling of 2011081 in words is "two million, eleven thousand, eighty-one".