2112813 has 12 divisors (see below), whose sum is σ = 3071068. Its totient is φ = 1399680.

The previous prime is 2112793. The next prime is 2112821. The reversal of 2112813 is 3182112.

It can be written as a sum of positive squares in 2 ways, for example, as 1108809 + 1004004 = 1053^2 + 1002^2 .

It is not a de Polignac number, because 2112813 - 2¹⁰ = 2111789 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 (2112833) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 981 + ... + 2277.

2^2112813 is an apocalyptic number.

It is an amenable number.

2112813 is a deficient number, since it is larger than the sum of its proper divisors (958255).

2112813 is a wasteful number, since it uses less digits than its factorization.

2112813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1484 (or 1481 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 2112813 is about 1453.5518566601. The cubic root of 2112813 is about 128.3178340008.

Adding to 2112813 its reverse (3182112), we get a palindrome (5294925).

The spelling of 2112813 in words is "two million, one hundred twelve thousand, eight hundred thirteen".