680591 has 4 divisors (see below), whose sum is σ = 682752. Its totient is φ = 678432.

The previous prime is 680587. The next prime is 680597. The reversal of 680591 is 195086.

680591 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.

It is a cyclic number.

It is not a de Polignac number, because 680591 - 2² = 680587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 680591.

It is not an unprimeable number, because it can be changed into a prime (680597) 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, 506 + ... + 1271.

It is an arithmetic number, because the mean of its divisors is an integer number (170688).

2⁶⁸⁰⁵⁹¹ is an apocalyptic number.

680591 is a deficient number, since it is larger than the sum of its proper divisors (2161).

680591 is a wasteful number, since it uses less digits than its factorization.

680591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 680591 is about 824.9793936820. The cubic root of 680591 is about 87.9620618146.

The spelling of 680591 in words is "six hundred eighty thousand, five hundred ninety-one".