2099813 has 4 divisors (see below), whose sum is σ = 2103948. Its totient is φ = 2095680.

The previous prime is 2099809. The next prime is 2099821. The reversal of 2099813 is 3189902.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3189902 = 2 ⋅1594951.

It can be written as a sum of positive squares in 2 ways, for example, as 1085764 + 1014049 = 1042^2 + 1007^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099813 - 2² = 2099809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2099813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2099863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (525987).

2^2099813 is an apocalyptic number.

It is an amenable number.

2099813 is a deficient number, since it is larger than the sum of its proper divisors (4135).

2099813 is an equidigital number, since it uses as much as digits as its factorization.

2099813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4134.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 2099813 is about 1449.0731520527. The cubic root of 2099813 is about 128.0541153017.

The spelling of 2099813 in words is "two million, ninety-nine thousand, eight hundred thirteen".