818181819 has 48 divisors (see below), whose sum is σ = 1531129600. Its totient is φ = 408846528.

The previous prime is 818181817. The next prime is 818181827. The reversal of 818181819 is 918181818.

It is not a de Polignac number, because 818181819 - 2¹ = 818181817 is a prime.

It is a super-2 number, since 2×818181819² = 1338842977884297522, which contains 22 as substring.

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 47 ways as a sum of consecutive naturals, for example, 10729 + ... + 41850.

Almost surely, 2^818181819 is an apocalyptic number.

818181819 is a deficient number, since it is larger than the sum of its proper divisors (712947781).

818181819 is a wasteful number, since it uses less digits than its factorization.

818181819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52624 (or 52621 counting only the distinct ones).

The product of its digits is 36864, while the sum is 45.

The square root of 818181819 is about 28603.8776916697. The cubic root of 818181819 is about 935.2978619574.

Subtracting 818181819 from its reverse (918181818), we obtain a palindrome (99999999).

It can be divided in two parts, 8181 and 81819, that added together give a square (90000 = 300²).

The spelling of 818181819 in words is "eight hundred eighteen million, one hundred eighty-one thousand, eight hundred nineteen".