812137931111 has 4 divisors (see below), whose sum is σ = 874610079672. Its totient is φ = 749665782552.

The previous prime is 812137931083. The next prime is 812137931119. The reversal of 812137931111 is 111139731218.

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 812137931111 - 2³⁸ = 537260024167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812137931119) 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, 31236074261 + ... + 31236074286.

It is an arithmetic number, because the mean of its divisors is an integer number (218652519918).

Almost surely, 2^812137931111 is an apocalyptic number.

812137931111 is a deficient number, since it is larger than the sum of its proper divisors (62472148561).

812137931111 is a wasteful number, since it uses less digits than its factorization.

812137931111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62472148560.

The product of its digits is 9072, while the sum is 38.

The spelling of 812137931111 in words is "eight hundred twelve billion, one hundred thirty-seven million, nine hundred thirty-one thousand, one hundred eleven".