680221 has 4 divisors (see below), whose sum is σ = 720252. Its totient is φ = 640192.

The previous prime is 680213. The next prime is 680237. The reversal of 680221 is 122086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122086 = 2 ⋅61043.

It can be written as a sum of positive squares in 2 ways, for example, as 416025 + 264196 = 645^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 680221 - 2³ = 680213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680291) 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, 19990 + ... + 20023.

It is an arithmetic number, because the mean of its divisors is an integer number (180063).

2⁶⁸⁰²²¹ is an apocalyptic number.

It is an amenable number.

680221 is a deficient number, since it is larger than the sum of its proper divisors (40031).

680221 is a wasteful number, since it uses less digits than its factorization.

680221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40030.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 680221 is about 824.7551151706. The cubic root of 680221 is about 87.9461188756.

The spelling of 680221 in words is "six hundred eighty thousand, two hundred twenty-one".