1311161218 has 16 divisors (see below), whose sum is σ = 1992042360. Its totient is φ = 647191296.

The previous prime is 1311161179. The next prime is 1311161219. The reversal of 1311161218 is 8121611131.

It can be written as a sum of positive squares in 4 ways, for example, as 898380729 + 412780489 = 29973^2 + 20317^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1311161192 and 1311161201.

It is not an unprimeable number, because it can be changed into a prime (1311161219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49530 + ... + 71242.

Almost surely, 2^1311161218 is an apocalyptic number.

1311161218 is a deficient number, since it is larger than the sum of its proper divisors (680881142).

1311161218 is a wasteful number, since it uses less digits than its factorization.

1311161218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22101.

The product of its digits is 288, while the sum is 25.

The square root of 1311161218 is about 36209.9602043416. The cubic root of 1311161218 is about 1094.5073903011.

Adding to 1311161218 its reverse (8121611131), we get a palindrome (9432772349).

The spelling of 1311161218 in words is "one billion, three hundred eleven million, one hundred sixty-one thousand, two hundred eighteen".