705811 has 4 divisors (see below), whose sum is σ = 715824. Its totient is φ = 695800.

The previous prime is 705787. The next prime is 705821. The reversal of 705811 is 118507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118507 = 17 ⋅6971.

It is not a de Polignac number, because 705811 - 2⁵ = 705779 is a prime.

It is a Duffinian number.

705811 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (705821) 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, 4900 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (178956).

2⁷⁰⁵⁸¹¹ is an apocalyptic number.

705811 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

705811 is a deficient number, since it is larger than the sum of its proper divisors (10013).

705811 is an equidigital number, since it uses as much as digits as its factorization.

705811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10012.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 705811 is about 840.1255858501. The cubic root of 705811 is about 89.0354191390.

The spelling of 705811 in words is "seven hundred five thousand, eight hundred eleven".