681797 has 4 divisors (see below), whose sum is σ = 693036. Its totient is φ = 670560.

The previous prime is 681787. The next prime is 681809. The reversal of 681797 is 797186.

It is a happy number.

681797 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 279841 + 401956 = 529^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 681797 - 2⁴ = 681781 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681727) 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, 5528 + ... + 5649.

It is an arithmetic number, because the mean of its divisors is an integer number (173259).

2⁶⁸¹⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

681797 is a deficient number, since it is larger than the sum of its proper divisors (11239).

681797 is a wasteful number, since it uses less digits than its factorization.

681797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11238.

The product of its digits is 21168, while the sum is 38.

The square root of 681797 is about 825.7099975173. The cubic root of 681797 is about 88.0139871018.

It can be divided in two parts, 68179 and 7, that added together give a palindrome (68186).

The spelling of 681797 in words is "six hundred eighty-one thousand, seven hundred ninety-seven".