2006813 has 2 divisors, whose sum is σ = 2006814. Its totient is φ = 2006812.

The previous prime is 2006791. The next prime is 2006831. The reversal of 2006813 is 3186002.

Together with next prime (2006831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1965604 + 41209 = 1402^2 + 203^2 .

It is a cyclic number.

It is not a de Polignac number, because 2006813 - 2¹⁰ = 2005789 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1003406 + 1003407.

It is an arithmetic number, because the mean of its divisors is an integer number (1003407).

2^2006813 is an apocalyptic number.

It is an amenable number.

2006813 is a deficient number, since it is larger than the sum of its proper divisors (1).

2006813 is an equidigital number, since it uses as much as digits as its factorization.

2006813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2006813 is about 1416.6202737502. The cubic root of 2006813 is about 126.1350068822.

The spelling of 2006813 in words is "two million, six thousand, eight hundred thirteen".