681659 has 8 divisors (see below), whose sum is σ = 768000. Its totient is φ = 599400.

The previous prime is 681647. The next prime is 681673. The reversal of 681659 is 956186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681659 - 2⁸ = 681403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (96000).

2⁶⁸¹⁶⁵⁹ is an apocalyptic number.

681659 is a deficient number, since it is larger than the sum of its proper divisors (86341).

681659 is a wasteful number, since it uses less digits than its factorization.

681659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041.

The product of its digits is 12960, while the sum is 35.

The square root of 681659 is about 825.6264288406. The cubic root of 681659 is about 88.0080485063.

The spelling of 681659 in words is "six hundred eighty-one thousand, six hundred fifty-nine".