2181015 has 24 divisors (see below), whose sum is σ = 4004208. Its totient is φ = 1094400.

The previous prime is 2181007. The next prime is 2181017. The reversal of 2181015 is 5101812.

2181015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2181015 - 2³ = 2181007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181017) 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, 661 + ... + 2190.

It is an arithmetic number, because the mean of its divisors is an integer number (166842).

2^2181015 is an apocalyptic number.

2181015 is a deficient number, since it is larger than the sum of its proper divisors (1823193).

2181015 is a wasteful number, since it uses less digits than its factorization.

2181015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879 (or 2876 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 2181015 is about 1476.8259883954. The cubic root of 2181015 is about 129.6839462422.

Adding to 2181015 its reverse (5101812), we get a palindrome (7282827).

The spelling of 2181015 in words is "two million, one hundred eighty-one thousand, fifteen".