681323 has 4 divisors (see below), whose sum is σ = 691560. Its totient is φ = 671088.

The previous prime is 681311. The next prime is 681337. The reversal of 681323 is 323186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681323 - 2⁶ = 681259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681523) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5018 + ... + 5151.

It is an arithmetic number, because the mean of its divisors is an integer number (172890).

2⁶⁸¹³²³ is an apocalyptic number.

681323 is a deficient number, since it is larger than the sum of its proper divisors (10237).

681323 is a wasteful number, since it uses less digits than its factorization.

681323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10236.

The product of its digits is 864, while the sum is 23.

The square root of 681323 is about 825.4229219013. The cubic root of 681323 is about 87.9935859650.

The spelling of 681323 in words is "six hundred eighty-one thousand, three hundred twenty-three".