805611 has 4 divisors (see below), whose sum is σ = 1074152. Its totient is φ = 537072.

The previous prime is 805589. The next prime is 805633. The reversal of 805611 is 116508.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (805589) and next prime (805633).

It is not a de Polignac number, because 805611 - 2⁹ = 805099 is a prime.

It is a D-number.

It is a Duffinian number.

805611 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (805111) 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 3 ways as a sum of consecutive naturals, for example, 134266 + ... + 134271.

It is an arithmetic number, because the mean of its divisors is an integer number (268538).

2⁸⁰⁵⁶¹¹ is an apocalyptic number.

805611 is a deficient number, since it is larger than the sum of its proper divisors (268541).

805611 is a wasteful number, since it uses less digits than its factorization.

805611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268540.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 805611 is about 897.5583546489. The cubic root of 805611 is about 93.0483041931.

The spelling of 805611 in words is "eight hundred five thousand, six hundred eleven".