684601 has 4 divisors (see below), whose sum is σ = 697572. Its totient is φ = 671632.

The previous prime is 684599. The next prime is 684617. The reversal of 684601 is 106486.

684601 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 can be written as a sum of positive squares in 2 ways, for example, as 435600 + 249001 = 660^2 + 499^2 .

It is a cyclic number.

It is not a de Polignac number, because 684601 - 2¹ = 684599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (624601) 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, 6406 + ... + 6511.

It is an arithmetic number, because the mean of its divisors is an integer number (174393).

2⁶⁸⁴⁶⁰¹ is an apocalyptic number.

It is an amenable number.

684601 is a deficient number, since it is larger than the sum of its proper divisors (12971).

684601 is a wasteful number, since it uses less digits than its factorization.

684601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12970.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 684601 is about 827.4061880358. The cubic root of 684601 is about 88.1344793049.

The spelling of 684601 in words is "six hundred eighty-four thousand, six hundred one".