1091065 has 4 divisors (see below), whose sum is σ = 1309284. Its totient is φ = 872848.

The previous prime is 1091063. The next prime is 1091071. The reversal of 1091065 is 5601901.

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 746496 + 344569 = 864^2 + 587^2 .

It is a cyclic number.

It is not a de Polignac number, because 1091065 - 2¹ = 1091063 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1091063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109102 + ... + 109111.

It is an arithmetic number, because the mean of its divisors is an integer number (327321).

2^1091065 is an apocalyptic number.

It is an amenable number.

1091065 is a deficient number, since it is larger than the sum of its proper divisors (218219).

1091065 is an equidigital number, since it uses as much as digits as its factorization.

1091065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218218.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 1091065 is about 1044.5405688627. The cubic root of 1091065 is about 102.9477536894.

Adding to 1091065 its reverse (5601901), we get a palindrome (6692966).

The spelling of 1091065 in words is "one million, ninety-one thousand, sixty-five".