2181813411 has 4 divisors (see below), whose sum is σ = 2909084552. Its totient is φ = 1454542272.

The previous prime is 2181813397. The next prime is 2181813443. The reversal of 2181813411 is 1143181812.

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

It is not a de Polignac number, because 2181813411 - 2¹⁰ = 2181812387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181813611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 363635566 + ... + 363635571.

It is an arithmetic number, because the mean of its divisors is an integer number (727271138).

Almost surely, 2^2181813411 is an apocalyptic number.

2181813411 is a deficient number, since it is larger than the sum of its proper divisors (727271141).

2181813411 is an equidigital number, since it uses as much as digits as its factorization.

2181813411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727271140.

The product of its digits is 1536, while the sum is 30.

The square root of 2181813411 is about 46709.8855811058. The cubic root of 2181813411 is about 1296.9976891455.

The spelling of 2181813411 in words is "two billion, one hundred eighty-one million, eight hundred thirteen thousand, four hundred eleven".