1089581856809 has 2 divisors, whose sum is σ = 1089581856810. Its totient is φ = 1089581856808.

The previous prime is 1089581856757. The next prime is 1089581856931. The reversal of 1089581856809 is 9086581859801.

1089581856809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 781747747225 + 307834109584 = 884165^2 + 554828^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089581856809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1089589856809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544790928404 + 544790928405.

It is an arithmetic number, because the mean of its divisors is an integer number (544790928405).

Almost surely, 2^{1089581856809} is an apocalyptic number.

It is an amenable number.

1089581856809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089581856809 is an equidigital number, since it uses as much as digits as its factorization.

1089581856809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49766400, while the sum is 68.

The spelling of 1089581856809 in words is "one trillion, eighty-nine billion, five hundred eighty-one million, eight hundred fifty-six thousand, eight hundred nine".