8181018 has 12 divisors (see below), whose sum is σ = 17725578. Its totient is φ = 2727000.

The previous prime is 8181011. The next prime is 8181023. The reversal of 8181018 is 8101818.

It can be written as a sum of positive squares in only one way, i.e., 4272489 + 3908529 = 2067^2 + 1977^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 8180982 and 8181000.

It is not an unprimeable number, because it can be changed into a prime (8181011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 227233 + ... + 227268.

Almost surely, 2^8181018 is an apocalyptic number.

8181018 is an abundant number, since it is smaller than the sum of its proper divisors (9544560).

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

8181018 is a wasteful number, since it uses less digits than its factorization.

8181018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454509 (or 454506 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

The square root of 8181018 is about 2860.2478913549. The cubic root of 8181018 is about 201.4972466256.

The spelling of 8181018 in words is "eight million, one hundred eighty-one thousand, eighteen".