811081 has 2 divisors, whose sum is σ = 811082. Its totient is φ = 811080.

The previous prime is 811067. The next prime is 811099. The reversal of 811081 is 180118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 292681 = 720^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 811081 - 2¹⁵ = 778313 is a prime.

It is a super-3 number, since 3×811081³ = 1600714719499333323, 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 (811981) 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 as a sum of consecutive naturals, namely, 405540 + 405541.

It is an arithmetic number, because the mean of its divisors is an integer number (405541).

2⁸¹¹⁰⁸¹ is an apocalyptic number.

It is an amenable number.

811081 is a deficient number, since it is larger than the sum of its proper divisors (1).

811081 is an equidigital number, since it uses as much as digits as its factorization.

811081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

The square root of 811081 is about 900.6003553186. The cubic root of 811081 is about 93.2584248726.

Adding to 811081 its reverse (180118), we get a palindrome (991199).

The spelling of 811081 in words is "eight hundred eleven thousand, eighty-one".