680521 has 4 divisors (see below), whose sum is σ = 687232. Its totient is φ = 673812.

The previous prime is 680509. The next prime is 680531. The reversal of 680521 is 125086.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 680521 - 2⁵ = 680489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 680492 and 680501.

It is not an unprimeable number, because it can be changed into a prime (680531) 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, 3201 + ... + 3406.

It is an arithmetic number, because the mean of its divisors is an integer number (171808).

2⁶⁸⁰⁵²¹ is an apocalyptic number.

It is an amenable number.

680521 is a deficient number, since it is larger than the sum of its proper divisors (6711).

680521 is a wasteful number, since it uses less digits than its factorization.

680521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 680521 is about 824.9369672890. The cubic root of 680521 is about 87.9590460262.

The spelling of 680521 in words is "six hundred eighty thousand, five hundred twenty-one".