2101813 has 8 divisors (see below), whose sum is σ = 2436480. Its totient is φ = 1775760.

The previous prime is 2101811. The next prime is 2101817. The reversal of 2101813 is 3181012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101813 - 2¹ = 2101811 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 (2101811) 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 7 ways as a sum of consecutive naturals, for example, 1618 + ... + 2611.

It is an arithmetic number, because the mean of its divisors is an integer number (304560).

2^2101813 is an apocalyptic number.

It is an amenable number.

2101813 is a deficient number, since it is larger than the sum of its proper divisors (334667).

2101813 is an equidigital number, since it uses as much as digits as its factorization.

2101813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 2101813 is about 1449.7630840934. The cubic root of 2101813 is about 128.0947581212.

Adding to 2101813 its reverse (3181012), we get a palindrome (5282825).

The spelling of 2101813 in words is "two million, one hundred one thousand, eight hundred thirteen".