818181818 has 8 divisors (see below), whose sum is σ = 1227810720. Its totient is φ = 408911580.

The previous prime is 818181817. The next prime is 818181827.

818181818 is nontrivially palindromic in base 10.

818181818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-3 number, since 3×818181818³ (a number of 28 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

818181818 is a strobogrammatic number because it is the same when read upside-down.

818181818 is an undulating number in base 10.

818181818 is a modest number, since divided by 181818 gives 818 as remainder.

It is not an unprimeable number, because it can be changed into a prime (818181817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83888 + ... + 93131.

It is an arithmetic number, because the mean of its divisors is an integer number (153476340).

Almost surely, 2^818181818 is an apocalyptic number.

818181818 is a deficient number, since it is larger than the sum of its proper divisors (409628902).

818181818 is a wasteful number, since it uses less digits than its factorization.

818181818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179332.

The product of its digits is 32768, while the sum is 44.

The square root of 818181818 is about 28603.8776741896. The cubic root of 818181818 is about 935.2978615763.

The spelling of 818181818 in words is "eight hundred eighteen million, one hundred eighty-one thousand, eight hundred eighteen".