2081813 has 2 divisors, whose sum is σ = 2081814. Its totient is φ = 2081812.

The previous prime is 2081809. The next prime is 2081831. The reversal of 2081813 is 3181802.

Together with next prime (2081831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1295044 + 786769 = 1138^2 + 887^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081813 - 2² = 2081809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040906 + 1040907.

It is an arithmetic number, because the mean of its divisors is an integer number (1040907).

2^2081813 is an apocalyptic number.

It is an amenable number.

2081813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081813 is an equidigital number, since it uses as much as digits as its factorization.

2081813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 2081813 is about 1442.8489179398. The cubic root of 2081813 is about 127.6871632845.

The spelling of 2081813 in words is "two million, eighty-one thousand, eight hundred thirteen".