2181067 has 24 divisors (see below), whose sum is σ = 2831360. Its totient is φ = 1639440.

The previous prime is 2181031. The next prime is 2181071. The reversal of 2181067 is 7601812.

2181067 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-2181067 is a prime.

It is an Ulam number.

2181067 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70342 + ... + 70372.

2^2181067 is an apocalyptic number.

2181067 is a deficient number, since it is larger than the sum of its proper divisors (650293).

2181067 is a wasteful number, since it uses less digits than its factorization.

2181067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 2181067 is about 1476.8435936144. The cubic root of 2181067 is about 129.6849768803.

Adding to 2181067 its reverse (7601812), we get a palindrome (9782879).

The spelling of 2181067 in words is "two million, one hundred eighty-one thousand, sixty-seven".