684811 has 4 divisors (see below), whose sum is σ = 725112. Its totient is φ = 644512.

The previous prime is 684809. The next prime is 684829. The reversal of 684811 is 118486.

684811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118486 = 2 ⋅59243.

It is a cyclic number.

It is not a de Polignac number, because 684811 - 2¹ = 684809 is a prime.

It is a super-2 number, since 2×684811² = 937932211442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 684811.

It is not an unprimeable number, because it can be changed into a prime (684841) 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, 20125 + ... + 20158.

It is an arithmetic number, because the mean of its divisors is an integer number (181278).

2⁶⁸⁴⁸¹¹ is an apocalyptic number.

684811 is a deficient number, since it is larger than the sum of its proper divisors (40301).

684811 is a wasteful number, since it uses less digits than its factorization.

684811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40300.

The product of its digits is 1536, while the sum is 28.

The square root of 684811 is about 827.5330809098. The cubic root of 684811 is about 88.1434900759.

It can be divided in two parts, 6848 and 11, that added together give a cube (6859 = 19³).

The spelling of 684811 in words is "six hundred eighty-four thousand, eight hundred eleven".