320381 has 4 divisors (see below), whose sum is σ = 321564. Its totient is φ = 319200.

The previous prime is 320377. The next prime is 320387. The reversal of 320381 is 183023.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1156 + 319225 = 34^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 320381 - 2² = 320377 is a prime.

It is a super-2 number, since 2×320381² = 205287970322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320381.

It is not an unprimeable number, because it can be changed into a prime (320387) 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, 41 + ... + 801.

It is an arithmetic number, because the mean of its divisors is an integer number (80391).

2³²⁰³⁸¹ is an apocalyptic number.

It is an amenable number.

320381 is a deficient number, since it is larger than the sum of its proper divisors (1183).

320381 is an equidigital number, since it uses as much as digits as its factorization.

320381 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 (nonzero) digits is 144, while the sum is 17.

The square root of 320381 is about 566.0220843748. The cubic root of 320381 is about 68.4261729688.

The spelling of 320381 in words is "three hundred twenty thousand, three hundred eighty-one".