1091071 has 2 divisors, whose sum is σ = 1091072. Its totient is φ = 1091070.

The previous prime is 1091063. The next prime is 1091119. The reversal of 1091071 is 1701901.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1701901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1091071 - 2³ = 1091063 is a prime.

It is a Chen prime.

It is equal to p₈₅₀₆₀ and since 1091071 and 85060 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1091021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545535 + 545536.

It is an arithmetic number, because the mean of its divisors is an integer number (545536).

2^1091071 is an apocalyptic number.

1091071 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091071 is an equidigital number, since it uses as much as digits as its factorization.

1091071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63, while the sum is 19.

The square root of 1091071 is about 1044.5434409348. The cubic root of 1091071 is about 102.9479423996.

Adding to 1091071 its reverse (1701901), we get a palindrome (2792972).

The spelling of 1091071 in words is "one million, ninety-one thousand, seventy-one".