8101818 has 12 divisors (see below), whose sum is σ = 17553978. Its totient is φ = 2700600.

The previous prime is 8101811. The next prime is 8101823. The reversal of 8101818 is 8181018.

It can be written as a sum of positive squares in only one way, i.e., 6036849 + 2064969 = 2457^2 + 1437^2 .

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

8101818 is a modest number, since divided by 1818 gives 810 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 8101791 and 8101800.

It is not an unprimeable number, because it can be changed into a prime (8101811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 225033 + ... + 225068.

Almost surely, 2^8101818 is an apocalyptic number.

8101818 is an abundant number, since it is smaller than the sum of its proper divisors (9452160).

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

8101818 is a wasteful number, since it uses less digits than its factorization.

8101818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450109 (or 450106 counting only the distinct ones).

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

The square root of 8101818 is about 2846.3692662759. The cubic root of 8101818 is about 200.8449089514.

It can be divided in two parts, 810 and 1818, that added together give a triangular number (2628 = T₇₂).

The spelling of 8101818 in words is "eight million, one hundred one thousand, eight hundred eighteen".