818081 has 6 divisors (see below), whose sum is σ = 899346. Its totient is φ = 743600.

The previous prime is 818021. The next prime is 818093. The reversal of 818081 is 180818.

It can be written as a sum of positive squares in only one way, i.e., 774400 + 43681 = 880^2 + 209^2 .

It is not a de Polignac number, because 818081 - 2⁶ = 818017 is a prime.

It is a super-2 number, since 2×818081² = 1338513045122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 818081.

It is not an unprimeable number, because it can be changed into a prime (818011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3260 + ... + 3501.

It is an arithmetic number, because the mean of its divisors is an integer number (149891).

2⁸¹⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

818081 is a deficient number, since it is larger than the sum of its proper divisors (81265).

818081 is a wasteful number, since it uses less digits than its factorization.

818081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6783 (or 6772 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 26.

The square root of 818081 is about 904.4783026696. The cubic root of 818081 is about 93.5259443574.

Adding to 818081 its reverse (180818), we get a palindrome (998899).

The spelling of 818081 in words is "eight hundred eighteen thousand, eighty-one".