818211 has 4 divisors (see below), whose sum is σ = 1090952. Its totient is φ = 545472.

The previous prime is 818189. The next prime is 818219. The reversal of 818211 is 112818.

818211 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 818211 - 2¹¹ = 816163 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (818219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136366 + ... + 136371.

It is an arithmetic number, because the mean of its divisors is an integer number (272738).

2⁸¹⁸²¹¹ is an apocalyptic number.

818211 is a deficient number, since it is larger than the sum of its proper divisors (272741).

818211 is a wasteful number, since it uses less digits than its factorization.

818211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272740.

The product of its digits is 128, while the sum is 21.

The square root of 818211 is about 904.5501644464. The cubic root of 818211 is about 93.5308981166.

The spelling of 818211 in words is "eight hundred eighteen thousand, two hundred eleven".