2013811 has 4 divisors (see below), whose sum is σ = 2101392. Its totient is φ = 1926232.

The previous prime is 2013787. The next prime is 2013821. The reversal of 2013811 is 1183102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2013811 - 2⁵ = 2013779 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2013821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43756 + ... + 43801.

It is an arithmetic number, because the mean of its divisors is an integer number (525348).

2^2013811 is an apocalyptic number.

2013811 is a deficient number, since it is larger than the sum of its proper divisors (87581).

2013811 is an equidigital number, since it uses as much as digits as its factorization.

2013811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87580.

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

The square root of 2013811 is about 1419.0880874703. The cubic root of 2013811 is about 126.2814528046.

Adding to 2013811 its reverse (1183102), we get a palindrome (3196913).

It can be divided in two parts, 20 and 13811, that added together give a palindrome (13831).

The spelling of 2013811 in words is "two million, thirteen thousand, eight hundred eleven".