1118181818 has 8 divisors (see below), whose sum is σ = 1806293748. Its totient is φ = 516083904.

The previous prime is 1118181803. The next prime is 1118181821. The reversal of 1118181818 is 8181818111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 989291209 + 128890609 = 31453^2 + 11353^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

1118181818 is a modest number, since divided by 181818 gives 1118 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21503471 + ... + 21503522.

Almost surely, 2^1118181818 is an apocalyptic number.

1118181818 is a deficient number, since it is larger than the sum of its proper divisors (688111930).

1118181818 is a wasteful number, since it uses less digits than its factorization.

1118181818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43007008.

The product of its digits is 4096, while the sum is 38.

The square root of 1118181818 is about 33439.2257386441. The cubic root of 1118181818 is about 1037.9365577133.

Adding to 1118181818 its reverse (8181818111), we get a palindrome (9299999929).

The spelling of 1118181818 in words is "one billion, one hundred eighteen million, one hundred eighty-one thousand, eight hundred eighteen".