605811 has 4 divisors (see below), whose sum is σ = 807752. Its totient is φ = 403872.

The previous prime is 605809. The next prime is 605837. The reversal of 605811 is 118506.

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

It is not a de Polignac number, because 605811 - 2¹ = 605809 is a prime.

It is a D-number.

It is a Duffinian number.

605811 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (605861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100966 + ... + 100971.

It is an arithmetic number, because the mean of its divisors is an integer number (201938).

2⁶⁰⁵⁸¹¹ is an apocalyptic number.

605811 is a deficient number, since it is larger than the sum of its proper divisors (201941).

605811 is a wasteful number, since it uses less digits than its factorization.

605811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201940.

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

The square root of 605811 is about 778.3386152569. The cubic root of 605811 is about 84.6146803713.

The spelling of 605811 in words is "six hundred five thousand, eight hundred eleven".