812806853 has 4 divisors (see below), whose sum is σ = 819999948. Its totient is φ = 805613760.

The previous prime is 812806849. The next prime is 812806859. The reversal of 812806853 is 358608218.

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

It can be written as a sum of positive squares in 2 ways, for example, as 307546369 + 505260484 = 17537^2 + 22478^2 .

It is a cyclic number.

It is not a de Polignac number, because 812806853 - 2² = 812806849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 812806853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812806859) 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, 3596378 + ... + 3596603.

It is an arithmetic number, because the mean of its divisors is an integer number (204999987).

Almost surely, 2^812806853 is an apocalyptic number.

It is an amenable number.

812806853 is a deficient number, since it is larger than the sum of its proper divisors (7193095).

812806853 is a wasteful number, since it uses less digits than its factorization.

812806853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7193094.

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 812806853 is about 28509.7676770611. The cubic root of 812806853 is about 933.2452443933.

The spelling of 812806853 in words is "eight hundred twelve million, eight hundred six thousand, eight hundred fifty-three".