8181811 has 8 divisors (see below), whose sum is σ = 9450864. Its totient is φ = 7000320.

The previous prime is 8181809. The next prime is 8181821. The reversal of 8181811 is 1181818.

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

It is a cyclic number.

It is not a de Polignac number, because 8181811 - 2¹ = 8181809 is a prime.

It is a Duffinian number.

8181811 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 8181811.

It is not an unprimeable number, because it can be changed into a prime (8181821) 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 7 ways as a sum of consecutive naturals, for example, 21690 + ... + 22063.

It is an arithmetic number, because the mean of its divisors is an integer number (1181358).

Almost surely, 2^8181811 is an apocalyptic number.

8181811 is a deficient number, since it is larger than the sum of its proper divisors (1269053).

8181811 is a wasteful number, since it uses less digits than its factorization.

8181811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43781.

The product of its digits is 512, while the sum is 28.

The square root of 8181811 is about 2860.3865123441. The cubic root of 8181811 is about 201.5037569057.

It can be divided in two parts, 81818 and 11, that multiplied together give a palindrome (899998).

The spelling of 8181811 in words is "eight million, one hundred eighty-one thousand, eight hundred eleven".