812206171 has 4 divisors (see below), whose sum is σ = 928235632. Its totient is φ = 696176712.

The previous prime is 812206141. The next prime is 812206181. The reversal of 812206171 is 171602218.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 812206171 - 2⁹ = 812205659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812206111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58014720 + ... + 58014733.

It is an arithmetic number, because the mean of its divisors is an integer number (232058908).

Almost surely, 2^812206171 is an apocalyptic number.

812206171 is a deficient number, since it is larger than the sum of its proper divisors (116029461).

812206171 is a wasteful number, since it uses less digits than its factorization.

812206171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116029460.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 812206171 is about 28499.2310598023. The cubic root of 812206171 is about 933.0152915375.

Adding to 812206171 its reverse (171602218), we get a palindrome (983808389).

The spelling of 812206171 in words is "eight hundred twelve million, two hundred six thousand, one hundred seventy-one".