818881 has 16 divisors (see below), whose sum is σ = 1013760. Its totient is φ = 645840.

The previous prime is 818837. The next prime is 818887. The reversal of 818881 is 188818.

It is a cyclic number.

It is not a de Polignac number, because 818881 - 2¹⁷ = 687809 is a prime.

It is a super-2 number, since 2×818881² = 1341132184322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818887) 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 15 ways as a sum of consecutive naturals, for example, 6186 + ... + 6316.

It is an arithmetic number, because the mean of its divisors is an integer number (63360).

2⁸¹⁸⁸⁸¹ is an apocalyptic number.

It is an amenable number.

818881 is a deficient number, since it is larger than the sum of its proper divisors (194879).

818881 is a wasteful number, since it uses less digits than its factorization.

818881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

The product of its digits is 4096, while the sum is 34.

The square root of 818881 is about 904.9204384917. The cubic root of 818881 is about 93.5564207119.

The spelling of 818881 in words is "eight hundred eighteen thousand, eight hundred eighty-one".