680811 has 4 divisors (see below), whose sum is σ = 907752. Its totient is φ = 453872.

The previous prime is 680809. The next prime is 680831. The reversal of 680811 is 118086.

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

It is a cyclic number.

It is not a de Polignac number, because 680811 - 2¹ = 680809 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (680831) 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, 113466 + ... + 113471.

It is an arithmetic number, because the mean of its divisors is an integer number (226938).

2⁶⁸⁰⁸¹¹ is an apocalyptic number.

680811 is a deficient number, since it is larger than the sum of its proper divisors (226941).

680811 is a wasteful number, since it uses less digits than its factorization.

680811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226940.

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 680811 is about 825.1127195723. The cubic root of 680811 is about 87.9715386609.

Adding to 680811 its reverse (118086), we get a palindrome (798897).

The spelling of 680811 in words is "six hundred eighty thousand, eight hundred eleven".