320081 has 2 divisors, whose sum is σ = 320082. Its totient is φ = 320080.

The previous prime is 320063. The next prime is 320083. The reversal of 320081 is 180023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 286225 + 33856 = 535^2 + 184^2 .

It is an emirp because it is prime and its reverse (180023) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 320081 - 2¹⁰ = 319057 is a prime.

It is a super-2 number, since 2×320081² = 204903693122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 320083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon 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 320081.

It is not a weakly prime, because it can be changed into another prime (320083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160040 + 160041.

It is an arithmetic number, because the mean of its divisors is an integer number (160041).

2³²⁰⁰⁸¹ is an apocalyptic number.

It is an amenable number.

320081 is a deficient number, since it is larger than the sum of its proper divisors (1).

320081 is an equidigital number, since it uses as much as digits as its factorization.

320081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 320081 is about 565.7570149808. The cubic root of 320081 is about 68.4048085490.

The spelling of 320081 in words is "three hundred twenty thousand, eighty-one".