1812711813 has 8 divisors (see below), whose sum is σ = 2636671776. Its totient is φ = 1098613200.

The previous prime is 1812711809. The next prime is 1812711821. The reversal of 1812711813 is 3181172181.

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

It is not a de Polignac number, because 1812711813 - 2² = 1812711809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 54930661 = 1812711813 / (1 + 8 + 1 + 2 + 7 + 1 + 1 + 8 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812711413) 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, 27465298 + ... + 27465363.

It is an arithmetic number, because the mean of its divisors is an integer number (329583972).

Almost surely, 2^1812711813 is an apocalyptic number.

It is an amenable number.

1812711813 is a deficient number, since it is larger than the sum of its proper divisors (823959963).

1812711813 is a wasteful number, since it uses less digits than its factorization.

1812711813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54930675.

The product of its digits is 2688, while the sum is 33.

The square root of 1812711813 is about 42575.9534596702. The cubic root of 1812711813 is about 1219.2972332129.

Adding to 1812711813 its reverse (3181172181), we get a palindrome (4993883994).

The spelling of 1812711813 in words is "one billion, eight hundred twelve million, seven hundred eleven thousand, eight hundred thirteen".