812189311 has 4 divisors (see below), whose sum is σ = 812260152. Its totient is φ = 812118472.

The previous prime is 812189269. The next prime is 812189321. The reversal of 812189311 is 113981218.

It is a happy number.

812189311 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 812189311 - 2⁹ = 812188799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812189321) 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, 13840 + ... + 42613.

It is an arithmetic number, because the mean of its divisors is an integer number (203065038).

Almost surely, 2^812189311 is an apocalyptic number.

812189311 is a deficient number, since it is larger than the sum of its proper divisors (70841).

812189311 is a wasteful number, since it uses less digits than its factorization.

812189311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70840.

The product of its digits is 3456, while the sum is 34.

The square root of 812189311 is about 28498.9352608128. The cubic root of 812189311 is about 933.0088355631.

The spelling of 812189311 in words is "eight hundred twelve million, one hundred eighty-nine thousand, three hundred eleven".