681759 has 12 divisors (see below), whose sum is σ = 1060696. Its totient is φ = 419472.

The previous prime is 681731. The next prime is 681763. The reversal of 681759 is 957186.

It is not a de Polignac number, because 681759 - 2⁵ = 681727 is a prime.

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 681759.

It is not an unprimeable number, because it can be changed into a prime (681719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2797 + ... + 3030.

2⁶⁸¹⁷⁵⁹ is an apocalyptic number.

681759 is a deficient number, since it is larger than the sum of its proper divisors (378937).

681759 is a wasteful number, since it uses less digits than its factorization.

681759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5846 (or 5843 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 681759 is about 825.6869866965. The cubic root of 681759 is about 88.0123519163.

The spelling of 681759 in words is "six hundred eighty-one thousand, seven hundred fifty-nine".