1091329 has 2 divisors, whose sum is σ = 1091330. Its totient is φ = 1091328.

The previous prime is 1091287. The next prime is 1091339. The reversal of 1091329 is 9231901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 121104 = 985^2 + 348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1091329 is a prime.

1091329 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1091339) 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 as a sum of consecutive naturals, namely, 545664 + 545665.

It is an arithmetic number, because the mean of its divisors is an integer number (545665).

2^1091329 is an apocalyptic number.

It is an amenable number.

1091329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091329 is an equidigital number, since it uses as much as digits as its factorization.

1091329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1091329 is about 1044.6669325675. Note that the first 3 decimals coincide. The cubic root of 1091329 is about 102.9560562852.

The spelling of 1091329 in words is "one million, ninety-one thousand, three hundred twenty-nine".