2011181813 has 16 divisors (see below), whose sum is σ = 2118972480. Its totient is φ = 1906160256.

The previous prime is 2011181807. The next prime is 2011181819. The reversal of 2011181813 is 3181811102.

It is an interprime number because it is at equal distance from previous prime (2011181807) and next prime (2011181819).

It is a de Polignac number, because none of the positive numbers 2^k-2011181813 is a prime.

It is a super-3 number, since 3×2011181813³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011181819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 606506 + ... + 609812.

It is an arithmetic number, because the mean of its divisors is an integer number (132435780).

Almost surely, 2^2011181813 is an apocalyptic number.

It is an amenable number.

2011181813 is a deficient number, since it is larger than the sum of its proper divisors (107790667).

2011181813 is a wasteful number, since it uses less digits than its factorization.

2011181813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 2011181813 is about 44846.2017678198. The cubic root of 2011181813 is about 1262.2647211532.

Adding to 2011181813 its reverse (3181811102), we get a palindrome (5192992915).

The spelling of 2011181813 in words is "two billion, eleven million, one hundred eighty-one thousand, eight hundred thirteen".