1812144831887 has 8 divisors (see below), whose sum is σ = 1957696872096. Its totient is φ = 1667472260832.

The previous prime is 1812144831853. The next prime is 1812144831899. The reversal of 1812144831887 is 7881384412181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1812144831887 - 2²⁰ = 1812143783311 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 (1812144830887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219863003 + ... + 219871244.

It is an arithmetic number, because the mean of its divisors is an integer number (244712109012).

Almost surely, 2^{1812144831887} is an apocalyptic number.

1812144831887 is a deficient number, since it is larger than the sum of its proper divisors (145552040209).

1812144831887 is a wasteful number, since it uses less digits than its factorization.

1812144831887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439734577.

The product of its digits is 2752512, while the sum is 56.

The spelling of 1812144831887 in words is "one trillion, eight hundred twelve billion, one hundred forty-four million, eight hundred thirty-one thousand, eight hundred eighty-seven".