2181118 has 16 divisors (see below), whose sum is σ = 3410064. Its totient is φ = 1045440.

The previous prime is 2181097. The next prime is 2181131. The reversal of 2181118 is 8111812.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5296 + ... + 5692.

It is an arithmetic number, because the mean of its divisors is an integer number (213129).

2^2181118 is an apocalyptic number.

2181118 is a deficient number, since it is larger than the sum of its proper divisors (1228946).

2181118 is a wasteful number, since it uses less digits than its factorization.

2181118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507.

The product of its digits is 128, while the sum is 22.

The square root of 2181118 is about 1476.8608600677. The cubic root of 2181118 is about 129.6859876826.

The spelling of 2181118 in words is "two million, one hundred eighty-one thousand, one hundred eighteen".