812494219 has 4 divisors (see below), whose sum is σ = 812670760. Its totient is φ = 812317680.

The previous prime is 812494181. The next prime is 812494301. The reversal of 812494219 is 912494218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912494218 = 2 ⋅456247109.

It is a cyclic number.

It is not a de Polignac number, because 812494219 - 2⁷ = 812494091 is a prime.

It is a super-2 number, since 2×812494219² = 1320293711816839922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812494919) 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, 81177 + ... + 90634.

It is an arithmetic number, because the mean of its divisors is an integer number (203167690).

Almost surely, 2^812494219 is an apocalyptic number.

812494219 is a deficient number, since it is larger than the sum of its proper divisors (176541).

812494219 is a wasteful number, since it uses less digits than its factorization.

812494219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176540.

The product of its digits is 41472, while the sum is 40.

The square root of 812494219 is about 28504.2842218499. The cubic root of 812494219 is about 933.1255761071.

Subtracting 812494219 from its reverse (912494218), we obtain a palindrome (99999999).

The spelling of 812494219 in words is "eight hundred twelve million, four hundred ninety-four thousand, two hundred nineteen".