812532813 has 4 divisors (see below), whose sum is σ = 1083377088. Its totient is φ = 541688540.

The previous prime is 812532811. The next prime is 812532821. The reversal of 812532813 is 318235218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 812532813 - 2¹ = 812532811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812532811) 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, 135422133 + ... + 135422138.

It is an arithmetic number, because the mean of its divisors is an integer number (270844272).

Almost surely, 2^812532813 is an apocalyptic number.

It is an amenable number.

812532813 is a deficient number, since it is larger than the sum of its proper divisors (270844275).

812532813 is a wasteful number, since it uses less digits than its factorization.

812532813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270844274.

The product of its digits is 11520, while the sum is 33.

The square root of 812532813 is about 28504.9611997631. The cubic root of 812532813 is about 933.1403505623.

The spelling of 812532813 in words is "eight hundred twelve million, five hundred thirty-two thousand, eight hundred thirteen".