684031 has 4 divisors (see below), whose sum is σ = 686152. Its totient is φ = 681912.

The previous prime is 684017. The next prime is 684037. The reversal of 684031 is 130486.

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 684031 - 2¹¹ = 681983 is a prime.

It is a super-2 number, since 2×684031² = 935796817922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 683993 and 684011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684037) 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, 465 + ... + 1258.

It is an arithmetic number, because the mean of its divisors is an integer number (171538).

2⁶⁸⁴⁰³¹ is an apocalyptic number.

684031 is a deficient number, since it is larger than the sum of its proper divisors (2121).

684031 is a wasteful number, since it uses less digits than its factorization.

684031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 684031 is about 827.0616663829. The cubic root of 684031 is about 88.1100122056.

The spelling of 684031 in words is "six hundred eighty-four thousand, thirty-one".