1091066 has 4 divisors (see below), whose sum is σ = 1636602. Its totient is φ = 545532.

The previous prime is 1091063. The next prime is 1091071. The reversal of 1091066 is 6601901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6601901 = 73 ⋅90437.

It can be written as a sum of positive squares in only one way, i.e., 942841 + 148225 = 971^2 + 385^2 .

It is a Curzon 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 as a sum of consecutive naturals, namely, 272765 + ... + 272768.

2^1091066 is an apocalyptic number.

1091066 is a deficient number, since it is larger than the sum of its proper divisors (545536).

1091066 is an equidigital number, since it uses as much as digits as its factorization.

1091066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545535.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 1091066 is about 1044.5410475419. The cubic root of 1091066 is about 102.9477851412.

Adding to 1091066 its reverse (6601901), we get a palindrome (7692967).

The spelling of 1091066 in words is "one million, ninety-one thousand, sixty-six".