323681 has 4 divisors (see below), whose sum is σ = 324864. Its totient is φ = 322500.

The previous prime is 323651. The next prime is 323699. The reversal of 323681 is 186323.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 186323 = 23 ⋅8101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-323681 is a prime.

It is a super-2 number, since 2×323681² = 209538779522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 323681.

It is not an unprimeable number, because it can be changed into a prime (323641) 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, 56 + ... + 806.

It is an arithmetic number, because the mean of its divisors is an integer number (81216).

2³²³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

323681 is a deficient number, since it is larger than the sum of its proper divisors (1183).

323681 is an equidigital number, since it uses as much as digits as its factorization.

323681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182.

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

The square root of 323681 is about 568.9296968871. The cubic root of 323681 is about 68.6603061735.

The spelling of 323681 in words is "three hundred twenty-three thousand, six hundred eighty-one".