2811813 has 16 divisors (see below), whose sum is σ = 3902976. Its totient is φ = 1799280.

The previous prime is 2811803. The next prime is 2811833. The reversal of 2811813 is 3181182.

It is not a de Polignac number, because 2811813 - 2¹⁸ = 2549669 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2811803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9006 + ... + 9312.

It is an arithmetic number, because the mean of its divisors is an integer number (243936).

2^2811813 is an apocalyptic number.

It is an amenable number.

2811813 is a deficient number, since it is larger than the sum of its proper divisors (1091163).

2811813 is a wasteful number, since it uses less digits than its factorization.

2811813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424.

The product of its digits is 384, while the sum is 24.

The square root of 2811813 is about 1676.8461467887. The cubic root of 2811813 is about 141.1439102095.

Adding to 2811813 its reverse (3181182), we get a palindrome (5992995).

The spelling of 2811813 in words is "two million, eight hundred eleven thousand, eight hundred thirteen".