683681 has 2 divisors, whose sum is σ = 683682. Its totient is φ = 683680.

The previous prime is 683653. The next prime is 683687. The reversal of 683681 is 186386.

683681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 43681 = 800^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 683681 - 2¹⁰ = 682657 is a prime.

It is a super-2 number, since 2×683681² = 934839419522, which contains 22 as substring.

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 683681.

It is not a weakly prime, because it can be changed into another prime (683687) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341840 + 341841.

It is an arithmetic number, because the mean of its divisors is an integer number (341841).

2⁶⁸³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

683681 is a deficient number, since it is larger than the sum of its proper divisors (1).

683681 is an equidigital number, since it uses as much as digits as its factorization.

683681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 683681 is about 826.8500468646. The cubic root of 683681 is about 88.0949818120.

The spelling of 683681 in words is "six hundred eighty-three thousand, six hundred eighty-one".