681322 has 4 divisors (see below), whose sum is σ = 1021986. Its totient is φ = 340660.

The previous prime is 681311. The next prime is 681337. The reversal of 681322 is 223186.

681322 is nontrivially palindromic in base 16.

681322 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 223186 = 2 ⋅111593.

It can be written as a sum of positive squares in only one way, i.e., 488601 + 192721 = 699^2 + 439^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 681293 and 681302.

It is an unprimeable number.

681322 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170329 + ... + 170332.

2⁶⁸¹³²² is an apocalyptic number.

681322 is a deficient number, since it is larger than the sum of its proper divisors (340664).

681322 is a wasteful number, since it uses less digits than its factorization.

681322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340663.

The product of its digits is 576, while the sum is 22.

The square root of 681322 is about 825.4223161510. The cubic root of 681322 is about 87.9935429146.

The spelling of 681322 in words is "six hundred eighty-one thousand, three hundred twenty-two".