1189318849 has 4 divisors (see below), whose sum is σ = 1189417264. Its totient is φ = 1189220436.

The previous prime is 1189318817. The next prime is 1189318859. The reversal of 1189318849 is 9488139811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1189318849 - 2⁵ = 1189318817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1189318796 and 1189318805.

It is not an unprimeable number, because it can be changed into a prime (1189318859) 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 in 3 ways as a sum of consecutive naturals, for example, 28047 + ... + 56260.

It is an arithmetic number, because the mean of its divisors is an integer number (297354316).

Almost surely, 2^1189318849 is an apocalyptic number.

It is an amenable number.

1189318849 is a deficient number, since it is larger than the sum of its proper divisors (98415).

1189318849 is an equidigital number, since it uses as much as digits as its factorization.

1189318849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98414.

The product of its digits is 497664, while the sum is 52.

The square root of 1189318849 is about 34486.5024176126. The cubic root of 1189318849 is about 1059.4962745451.

The spelling of 1189318849 in words is "one billion, one hundred eighty-nine million, three hundred eighteen thousand, eight hundred forty-nine".