321311 has 2 divisors, whose sum is σ = 321312. Its totient is φ = 321310.

The previous prime is 321301. The next prime is 321313. The reversal of 321311 is 113123.

It is a strong prime.

It is an emirp because it is prime and its reverse (113123) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 321311 - 2⁶ = 321247 is a prime.

It is a Sophie Germain prime.

Together with 321313, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 321292 and 321301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160655 + 160656.

It is an arithmetic number, because the mean of its divisors is an integer number (160656).

2³²¹³¹¹ is an apocalyptic number.

321311 is the 254-th centered decagonal number.

321311 is a deficient number, since it is larger than the sum of its proper divisors (1).

321311 is an equidigital number, since it uses as much as digits as its factorization.

321311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 11.

The square root of 321311 is about 566.8430117766. The cubic root of 321311 is about 68.4923180332.

Adding to 321311 its reverse (113123), we get a palindrome (434434).

The spelling of 321311 in words is "three hundred twenty-one thousand, three hundred eleven", and thus it is an iban number.