681205 has 8 divisors (see below), whose sum is σ = 934272. Its totient is φ = 467088.

The previous prime is 681179. The next prime is 681221. The reversal of 681205 is 502186.

It is a happy number.

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 681205 - 2¹¹ = 679157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9697 + ... + 9766.

It is an arithmetic number, because the mean of its divisors is an integer number (116784).

2⁶⁸¹²⁰⁵ is an apocalyptic number.

It is an amenable number.

681205 is a deficient number, since it is larger than the sum of its proper divisors (253067).

681205 is a wasteful number, since it uses less digits than its factorization.

681205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19475.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 681205 is about 825.3514402968. The cubic root of 681205 is about 87.9885057301.

The spelling of 681205 in words is "six hundred eighty-one thousand, two hundred five".