1091181859 has 2 divisors, whose sum is σ = 1091181860. Its totient is φ = 1091181858.

The previous prime is 1091181853. The next prime is 1091181863. The reversal of 1091181859 is 9581811901.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (9581811901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1091181859 - 2¹¹ = 1091179811 is a prime.

It is not a weakly prime, because it can be changed into another prime (1091181853) 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, 545590929 + 545590930.

It is an arithmetic number, because the mean of its divisors is an integer number (545590930).

Almost surely, 2^1091181859 is an apocalyptic number.

1091181859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1091181859 is an equidigital number, since it uses as much as digits as its factorization.

1091181859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 43.

The square root of 1091181859 is about 33033.0419277426. The cubic root of 1091181859 is about 1029.5142897977.

The spelling of 1091181859 in words is "one billion, ninety-one million, one hundred eighty-one thousand, eight hundred fifty-nine".