2013813 has 6 divisors (see below), whose sum is σ = 2908854. Its totient is φ = 1342536.

The previous prime is 2013787. The next prime is 2013821. The reversal of 2013813 is 3183102.

It can be written as a sum of positive squares in only one way, i.e., 1912689 + 101124 = 1383^2 + 318^2 .

It is not a de Polignac number, because 2013813 - 2⁶ = 2013749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013833) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111870 + ... + 111887.

It is an arithmetic number, because the mean of its divisors is an integer number (484809).

2^2013813 is an apocalyptic number.

It is an amenable number.

2013813 is a deficient number, since it is larger than the sum of its proper divisors (895041).

2013813 is a wasteful number, since it uses less digits than its factorization.

2013813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223763 (or 223760 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2013813 is about 1419.0887921480. The cubic root of 2013813 is about 126.2814946097.

Adding to 2013813 its reverse (3183102), we get a palindrome (5196915).

The spelling of 2013813 in words is "two million, thirteen thousand, eight hundred thirteen".