1066321 has 4 divisors (see below), whose sum is σ = 1077412. Its totient is φ = 1055232.

The previous prime is 1066319. The next prime is 1066327. The reversal of 1066321 is 1236601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1236601 = 41 ⋅30161.

It can be written as a sum of positive squares in 2 ways, for example, as 318096 + 748225 = 564^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066321 - 2¹ = 1066319 is a prime.

It is a super-2 number, since 2×1066321² = 2274080950082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066327) 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, 5400 + ... + 5593.

It is an arithmetic number, because the mean of its divisors is an integer number (269353).

2^1066321 is an apocalyptic number.

It is an amenable number.

1066321 is a deficient number, since it is larger than the sum of its proper divisors (11091).

1066321 is an equidigital number, since it uses as much as digits as its factorization.

1066321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11090.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1066321 is about 1032.6282002735. The cubic root of 1066321 is about 102.1635528089.

The spelling of 1066321 in words is "one million, sixty-six thousand, three hundred twenty-one".