1321105 has 4 divisors (see below), whose sum is σ = 1585332. Its totient is φ = 1056880.

The previous prime is 1321093. The next prime is 1321109. The reversal of 1321105 is 5011231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1046529 + 274576 = 1023^2 + 524^2 .

It is not a de Polignac number, because 1321105 - 2¹¹ = 1319057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132106 + ... + 132115.

It is an arithmetic number, because the mean of its divisors is an integer number (396333).

2^1321105 is an apocalyptic number.

It is an amenable number.

1321105 is a deficient number, since it is larger than the sum of its proper divisors (264227).

1321105 is an equidigital number, since it uses as much as digits as its factorization.

1321105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264226.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 1321105 is about 1149.3933182336. The cubic root of 1321105 is about 109.7267321640.

Adding to 1321105 its reverse (5011231), we get a palindrome (6332336).

The spelling of 1321105 in words is "one million, three hundred twenty-one thousand, one hundred five".