2181065 has 8 divisors (see below), whose sum is σ = 2625480. Its totient is φ = 1739392.

The previous prime is 2181031. The next prime is 2181071. The reversal of 2181065 is 5601812.

It can be written as a sum of positive squares in 4 ways, for example, as 1006009 + 1175056 = 1003^2 + 1084^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2181065 - 2¹⁴ = 2164681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2181065.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2117 + ... + 2973.

It is an arithmetic number, because the mean of its divisors is an integer number (328185).

2^2181065 is an apocalyptic number.

It is an amenable number.

2181065 is a deficient number, since it is larger than the sum of its proper divisors (444415).

2181065 is an equidigital number, since it uses as much as digits as its factorization.

2181065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 2181065 is about 1476.8429164945. The cubic root of 2181065 is about 129.6849372407.

Adding to 2181065 its reverse (5601812), we get a palindrome (7782877).

The spelling of 2181065 in words is "two million, one hundred eighty-one thousand, sixty-five".