811216 has 20 divisors (see below), whose sum is σ = 1796512. Its totient is φ = 347616.

The previous prime is 811207. The next prime is 811231. The reversal of 811216 is 612118.

It is a junction number, because it is equal to n+sod(n) for n = 811193 and 811202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3510 + ... + 3733.

2⁸¹¹²¹⁶ is an apocalyptic number.

It is an amenable number.

811216 is an abundant number, since it is smaller than the sum of its proper divisors (985296).

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

811216 is a wasteful number, since it uses less digits than its factorization.

811216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7258 (or 7252 counting only the distinct ones).

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

The square root of 811216 is about 900.6753022039. The cubic root of 811216 is about 93.2635987039.

It can be divided in two parts, 8112 and 16, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 811216 in words is "eight hundred eleven thousand, two hundred sixteen".