1091843 has 2 divisors, whose sum is σ = 1091844. Its totient is φ = 1091842.

The previous prime is 1091837. The next prime is 1091863. The reversal of 1091843 is 3481901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1091843 - 2¹⁰ = 1090819 is a prime.

It is a super-2 number, since 2×1091843² = 2384242273298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1091863) 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, 545921 + 545922.

It is an arithmetic number, because the mean of its divisors is an integer number (545922).

2^1091843 is an apocalyptic number.

1091843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091843 is an equidigital number, since it uses as much as digits as its factorization.

1091843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1091843 is about 1044.9129150317. The cubic root of 1091843 is about 102.9722173473.

The spelling of 1091843 in words is "one million, ninety-one thousand, eight hundred forty-three".