2181133 has 4 divisors (see below), whose sum is σ = 2184480. Its totient is φ = 2177788.

The previous prime is 2181131. The next prime is 2181139. The reversal of 2181133 is 3311812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2181133 - 2¹ = 2181131 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2181133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181131) 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 3 ways as a sum of consecutive naturals, for example, 343 + ... + 2116.

It is an arithmetic number, because the mean of its divisors is an integer number (546120).

2^2181133 is an apocalyptic number.

It is an amenable number.

2181133 is a deficient number, since it is larger than the sum of its proper divisors (3347).

2181133 is an equidigital number, since it uses as much as digits as its factorization.

2181133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3346.

The product of its digits is 144, while the sum is 19.

The square root of 2181133 is about 1476.8659383979. The cubic root of 2181133 is about 129.6862849743.

Adding to 2181133 its reverse (3311812), we get a palindrome (5492945).

The spelling of 2181133 in words is "two million, one hundred eighty-one thousand, one hundred thirty-three".