320811 has 4 divisors (see below), whose sum is σ = 427752. Its totient is φ = 213872.

The previous prime is 320791. The next prime is 320821. The reversal of 320811 is 118023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 118023 = 3 ⋅39341.

It is a cyclic number.

It is not a de Polignac number, because 320811 - 2¹³ = 312619 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (320821) 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, 53466 + ... + 53471.

It is an arithmetic number, because the mean of its divisors is an integer number (106938).

2³²⁰⁸¹¹ is an apocalyptic number.

320811 is a deficient number, since it is larger than the sum of its proper divisors (106941).

320811 is a wasteful number, since it uses less digits than its factorization.

320811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106940.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 320811 is about 566.4018008446. The cubic root of 320811 is about 68.4567720583.

Adding to 320811 its reverse (118023), we get a palindrome (438834).

The spelling of 320811 in words is "three hundred twenty thousand, eight hundred eleven".