681695 has 8 divisors (see below), whose sum is σ = 934944. Its totient is φ = 467424.

The previous prime is 681689. The next prime is 681719. The reversal of 681695 is 596186.

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 681695 - 2⁶ = 681631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 19477 = 681695 / (6 + 8 + 1 + 6 + 9 + 5).

It is a Duffinian number.

It is a plaindrome in base 6.

It is a zygodrome in base 6.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9704 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (116868).

2⁶⁸¹⁶⁹⁵ is an apocalyptic number.

681695 is a deficient number, since it is larger than the sum of its proper divisors (253249).

681695 is a wasteful number, since it uses less digits than its factorization.

681695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19489.

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

The square root of 681695 is about 825.6482301804. The cubic root of 681695 is about 88.0095977824.

The spelling of 681695 in words is "six hundred eighty-one thousand, six hundred ninety-five".