320681 has 4 divisors (see below), whose sum is σ = 327552. Its totient is φ = 313812.

The previous prime is 320669. The next prime is 320687. The reversal of 320681 is 186023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320681 - 2¹⁸ = 58537 is a prime.

It is a super-2 number, since 2×320681² = 205672607522, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320681.

It is not an unprimeable number, because it can be changed into a prime (320687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3365 + ... + 3458.

It is an arithmetic number, because the mean of its divisors is an integer number (81888).

2³²⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

320681 is a deficient number, since it is larger than the sum of its proper divisors (6871).

320681 is an equidigital number, since it uses as much as digits as its factorization.

320681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6870.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 320681 is about 566.2870296943. The cubic root of 320681 is about 68.4475240559.

It can be divided in two parts, 320 and 681, that added together give a palindrome (1001).

The spelling of 320681 in words is "three hundred twenty thousand, six hundred eighty-one".