1161181218 has 16 divisors (see below), whose sum is σ = 2323035936. Its totient is φ = 386948160.

The previous prime is 1161181169. The next prime is 1161181247. The reversal of 1161181218 is 8121811611.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4071 + ... + 48362.

It is an arithmetic number, because the mean of its divisors is an integer number (145189746).

Almost surely, 2^1161181218 is an apocalyptic number.

1161181218 is an abundant number, since it is smaller than the sum of its proper divisors (1161854718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1161181218 is a wasteful number, since it uses less digits than its factorization.

1161181218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56129.

The product of its digits is 768, while the sum is 30.

The square root of 1161181218 is about 34076.1091969139. The cubic root of 1161181218 is about 1051.0740990601.

Adding to 1161181218 its reverse (8121811611), we get a palindrome (9282992829).

It can be divided in two parts, 11611 and 81218, that added together give a palindrome (92829).

The spelling of 1161181218 in words is "one billion, one hundred sixty-one million, one hundred eighty-one thousand, two hundred eighteen".