816211 has 4 divisors (see below), whose sum is σ = 890424. Its totient is φ = 742000.

The previous prime is 816209. The next prime is 816217. The reversal of 816211 is 112618.

816211 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 a cyclic number.

It is not a de Polignac number, because 816211 - 2¹ = 816209 is a prime.

It is a Duffinian number.

816211 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (816217) 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, 37090 + ... + 37111.

It is an arithmetic number, because the mean of its divisors is an integer number (222606).

2⁸¹⁶²¹¹ is an apocalyptic number.

816211 is a deficient number, since it is larger than the sum of its proper divisors (74213).

816211 is a wasteful number, since it uses less digits than its factorization.

816211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74212.

The product of its digits is 96, while the sum is 19.

The square root of 816211 is about 903.4439661650. The cubic root of 816211 is about 93.4546282959.

Adding to 816211 its reverse (112618), we get a palindrome (928829).

The spelling of 816211 in words is "eight hundred sixteen thousand, two hundred eleven".