1812906772129 has 12 divisors (see below), whose sum is σ = 1839159618772. Its totient is φ = 1787023617120.

The previous prime is 1812906772073. The next prime is 1812906772147. The reversal of 1812906772129 is 9212776092181.

It can be written as a sum of positive squares in 2 ways, for example, as 1167739584400 + 645167187729 = 1080620^2 + 803223^2 .

It is not a de Polignac number, because 1812906772129 - 2¹⁵ = 1812906739361 is a prime.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

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 1812906772129.

It is not an unprimeable number, because it can be changed into a prime (1812903772129) 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 11 ways as a sum of consecutive naturals, for example, 27980479 + ... + 28045195.

Almost surely, 2^{1812906772129} is an apocalyptic number.

It is an amenable number.

1812906772129 is a deficient number, since it is larger than the sum of its proper divisors (26252846643).

1812906772129 is an frugal number, since it uses more digits than its factorization.

1812906772129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70416 (or 70345 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 1812906772129 in words is "one trillion, eight hundred twelve billion, nine hundred six million, seven hundred seventy-two thousand, one hundred twenty-nine".