812249513 has 4 divisors (see below), whose sum is σ = 812387268. Its totient is φ = 812111760.

The previous prime is 812249497. The next prime is 812249521. The reversal of 812249513 is 315942218.

812249513 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.

It can be written as a sum of positive squares in 2 ways, for example, as 61653904 + 750595609 = 7852^2 + 27397^2 .

It is a cyclic number.

It is not a de Polignac number, because 812249513 - 2⁴ = 812249497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812249533) 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, 59618 + ... + 71963.

It is an arithmetic number, because the mean of its divisors is an integer number (203096817).

Almost surely, 2^812249513 is an apocalyptic number.

It is an amenable number.

812249513 is a deficient number, since it is larger than the sum of its proper divisors (137755).

812249513 is a wasteful number, since it uses less digits than its factorization.

812249513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137754.

The product of its digits is 17280, while the sum is 35.

The square root of 812249513 is about 28499.9914561391. The cubic root of 812249513 is about 933.0318875000.

The spelling of 812249513 in words is "eight hundred twelve million, two hundred forty-nine thousand, five hundred thirteen".