1091023 has 2 divisors, whose sum is σ = 1091024. Its totient is φ = 1091022.

The previous prime is 1091021. The next prime is 1091033. The reversal of 1091023 is 3201901.

It is a weak prime.

It is an emirp because it is prime and its reverse (3201901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1091023 - 2¹ = 1091021 is a prime.

Together with 1091021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1090988 and 1091006.

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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545511 + 545512.

It is an arithmetic number, because the mean of its divisors is an integer number (545512).

2^1091023 is an apocalyptic number.

1091023 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091023 is an equidigital number, since it uses as much as digits as its factorization.

1091023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1091023 is about 1044.5204641365. The cubic root of 1091023 is about 102.9464326984.

Adding to 1091023 its reverse (3201901), we get a palindrome (4292924).

The spelling of 1091023 in words is "one million, ninety-one thousand, twenty-three".