1091243 has 2 divisors, whose sum is σ = 1091244. Its totient is φ = 1091242.

The previous prime is 1091239. The next prime is 1091257. The reversal of 1091243 is 3421901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1091243 - 2² = 1091239 is a prime.

It is a super-2 number, since 2×1091243² = 2381622570098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1091263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545621 + 545622.

It is an arithmetic number, because the mean of its divisors is an integer number (545622).

2^1091243 is an apocalyptic number.

1091243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091243 is an equidigital number, since it uses as much as digits as its factorization.

1091243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1091243 is about 1044.6257703120. The cubic root of 1091243 is about 102.9533517988.

The spelling of 1091243 in words is "one million, ninety-one thousand, two hundred forty-three".