681855 has 16 divisors (see below), whose sum is σ = 1102464. Its totient is φ = 359840.

The previous prime is 681841. The next prime is 681883. The reversal of 681855 is 558186.

It is not a de Polignac number, because 681855 - 2⁴ = 681839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1792 + ... + 2138.

It is an arithmetic number, because the mean of its divisors is an integer number (68904).

2⁶⁸¹⁸⁵⁵ is an apocalyptic number.

681855 is a deficient number, since it is larger than the sum of its proper divisors (420609).

681855 is a wasteful number, since it uses less digits than its factorization.

681855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486.

The product of its digits is 9600, while the sum is 33.

The square root of 681855 is about 825.7451180600. The cubic root of 681855 is about 88.0164827940.

The spelling of 681855 in words is "six hundred eighty-one thousand, eight hundred fifty-five".