812219 has 4 divisors (see below), whose sum is σ = 814296. Its totient is φ = 810144.

The previous prime is 812213. The next prime is 812221. The reversal of 812219 is 912218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912218 = 2 ⋅456109.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-812219 is a prime.

It is a super-2 number, since 2×812219² = 1319399407922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 812194 and 812203.

It is not an unprimeable number, because it can be changed into a prime (812213) 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 3 ways as a sum of consecutive naturals, for example, 254 + ... + 1299.

It is an arithmetic number, because the mean of its divisors is an integer number (203574).

2⁸¹²²¹⁹ is an apocalyptic number.

812219 is a deficient number, since it is larger than the sum of its proper divisors (2077).

812219 is a wasteful number, since it uses less digits than its factorization.

812219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076.

The product of its digits is 288, while the sum is 23.

The square root of 812219 is about 901.2319346317. The cubic root of 812219 is about 93.3020203915.

Subtracting 812219 from its reverse (912218), we obtain a palindrome (99999).

The spelling of 812219 in words is "eight hundred twelve thousand, two hundred nineteen".