1091381843 has 2 divisors, whose sum is σ = 1091381844. Its totient is φ = 1091381842.

The previous prime is 1091381833. The next prime is 1091381849. The reversal of 1091381843 is 3481831901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1091381843 - 2¹⁰ = 1091380819 is a prime.

It is a super-2 number, since 2×1091381843² = 2382228654460153298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1091381797 and 1091381806.

It is not a weakly prime, because it can be changed into another prime (1091381849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545690921 + 545690922.

It is an arithmetic number, because the mean of its divisors is an integer number (545690922).

Almost surely, 2^1091381843 is an apocalyptic number.

1091381843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091381843 is an equidigital number, since it uses as much as digits as its factorization.

1091381843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1091381843 is about 33036.0688187926. The cubic root of 1091381843 is about 1029.5771799589.

The spelling of 1091381843 in words is "one billion, ninety-one million, three hundred eighty-one thousand, eight hundred forty-three".