805111 has 2 divisors, whose sum is σ = 805112. Its totient is φ = 805110.

The previous prime is 805109. The next prime is 805121. The reversal of 805111 is 111508.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 805111 - 2¹ = 805109 is a prime.

Together with 805109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805121) 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 as a sum of consecutive naturals, namely, 402555 + 402556.

It is an arithmetic number, because the mean of its divisors is an integer number (402556).

2⁸⁰⁵¹¹¹ is an apocalyptic number.

805111 is a deficient number, since it is larger than the sum of its proper divisors (1).

805111 is an equidigital number, since it uses as much as digits as its factorization.

805111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40, while the sum is 16.

The square root of 805111 is about 897.2797779957. The cubic root of 805111 is about 93.0290501609.

Adding to 805111 its reverse (111508), we get a palindrome (916619).

The spelling of 805111 in words is "eight hundred five thousand, one hundred eleven".