1812036362161 has 3 divisors (see below), whose sum is σ = 1812037708281. Its totient is φ = 1812035016042.

The previous prime is 1812036362141. The next prime is 1812036362173. The reversal of 1812036362161 is 1612636302181.

The square root of 1812036362161 is 1346119.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 1812036362161 - 2¹⁹ = 1812035837873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1812036362141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 673060 + ... + 2019178.

It is an arithmetic number, because the mean of its divisors is an integer number (604012569427).

Almost surely, 2^{1812036362161} is an apocalyptic number.

1812036362161 is the 1346119-th square number.

1812036362161 is the 673060-th centered octagonal number.

It is an amenable number.

1812036362161 is a deficient number, since it is larger than the sum of its proper divisors (1346120).

1812036362161 is an frugal number, since it uses more digits than its factorization.

1812036362161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692238 (or 1346119 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

It can be divided in two parts, 181203 and 6362161, that added together give a square (6543364 = 2558²).

The spelling of 1812036362161 in words is "one trillion, eight hundred twelve billion, thirty-six million, three hundred sixty-two thousand, one hundred sixty-one".