1189318809 has 16 divisors (see below), whose sum is σ = 1839346688. Its totient is φ = 669466512.

The previous prime is 1189318777. The next prime is 1189318817. The reversal of 1189318809 is 9088139811.

It is not a de Polignac number, because 1189318809 - 2⁵ = 1189318777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1189318859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421237 + ... + 424050.

It is an arithmetic number, because the mean of its divisors is an integer number (114959168).

Almost surely, 2^1189318809 is an apocalyptic number.

It is an amenable number.

1189318809 is a deficient number, since it is larger than the sum of its proper divisors (650027879).

1189318809 is an equidigital number, since it uses as much as digits as its factorization.

1189318809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845364.

The product of its (nonzero) digits is 124416, while the sum is 48.

The square root of 1189318809 is about 34486.5018376756. The cubic root of 1189318809 is about 1059.4962626672.

The spelling of 1189318809 in words is "one billion, one hundred eighty-nine million, three hundred eighteen thousand, eight hundred nine".