11781089 has 2 divisors, whose sum is σ = 11781090. Its totient is φ = 11781088.

The previous prime is 11781043. The next prime is 11781139. The reversal of 11781089 is 98018711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11444689 + 336400 = 3383^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 11781089 - 2⁸ = 11780833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11781389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5890544 + 5890545.

It is an arithmetic number, because the mean of its divisors is an integer number (5890545).

Almost surely, 2^11781089 is an apocalyptic number.

It is an amenable number.

11781089 is a deficient number, since it is larger than the sum of its proper divisors (1).

11781089 is an equidigital number, since it uses as much as digits as its factorization.

11781089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 11781089 is about 3432.3591012597. The cubic root of 11781089 is about 227.5421264017.

The spelling of 11781089 in words is "eleven million, seven hundred eighty-one thousand, eighty-nine".