321109 has 2 divisors, whose sum is σ = 321110. Its totient is φ = 321108.

The previous prime is 321091. The next prime is 321143. The reversal of 321109 is 901123.

Together with previous prime (321091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260100 + 61009 = 510^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 321109 - 2⁵ = 321077 is a prime.

It is a super-2 number, since 2×321109² = 206221979762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 321092 and 321101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160554 + 160555.

It is an arithmetic number, because the mean of its divisors is an integer number (160555).

2³²¹¹⁰⁹ is an apocalyptic number.

It is an amenable number.

321109 is a deficient number, since it is larger than the sum of its proper divisors (1).

321109 is an equidigital number, since it uses as much as digits as its factorization.

321109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 321109 is about 566.6648039185. The cubic root of 321109 is about 68.4779619020.

It can be divided in two parts, 3 and 21109, that added together give a palindrome (21112).

The spelling of 321109 in words is "three hundred twenty-one thousand, one hundred nine".