812244539 has 4 divisors (see below), whose sum is σ = 812358456. Its totient is φ = 812130624.

The previous prime is 812244533. The next prime is 812244571. The reversal of 812244539 is 935442218.

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

It is a cyclic number.

It is not a de Polignac number, because 812244539 - 2⁴ = 812244523 is a prime.

It is a super-2 number, since 2×812244539² = 1319482382270645042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812244533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45494 + ... + 60779.

It is an arithmetic number, because the mean of its divisors is an integer number (203089614).

Almost surely, 2^812244539 is an apocalyptic number.

812244539 is a deficient number, since it is larger than the sum of its proper divisors (113917).

812244539 is a wasteful number, since it uses less digits than its factorization.

812244539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113916.

The product of its digits is 69120, while the sum is 38.

The square root of 812244539 is about 28499.9041928214. The cubic root of 812244539 is about 933.0299829497.

The spelling of 812244539 in words is "eight hundred twelve million, two hundred forty-four thousand, five hundred thirty-nine".