812218663031 has 4 divisors (see below), whose sum is σ = 831107469192. Its totient is φ = 793329856872.

The previous prime is 812218662991. The next prime is 812218663079. The reversal of 812218663031 is 130366812218.

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 812218663031 - 2¹⁰ = 812218662007 is a prime.

It is a super-2 number, since 2×812218663031² (a number of 25 digits) contains 22 as substring.

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 812218663031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812218663631) 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, 9444403016 + ... + 9444403101.

It is an arithmetic number, because the mean of its divisors is an integer number (207776867298).

Almost surely, 2^812218663031 is an apocalyptic number.

812218663031 is a deficient number, since it is larger than the sum of its proper divisors (18888806161).

812218663031 is a wasteful number, since it uses less digits than its factorization.

812218663031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18888806160.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 812218663031 in words is "eight hundred twelve billion, two hundred eighteen million, six hundred sixty-three thousand, thirty-one".