2271865 has 8 divisors (see below), whose sum is σ = 2751048. Its totient is φ = 1800960.

The previous prime is 2271859. The next prime is 2271869. The reversal of 2271865 is 5681722.

2271865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 166464 + 2105401 = 408^2 + 1451^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-2271865 is a prime.

It is a super-2 number, since 2×2271865² = 10322741156450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2271869) 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 7 ways as a sum of consecutive naturals, for example, 1446 + ... + 2575.

It is an arithmetic number, because the mean of its divisors is an integer number (343881).

2^2271865 is an apocalyptic number.

It is an amenable number.

2271865 is a deficient number, since it is larger than the sum of its proper divisors (479183).

2271865 is a wasteful number, since it uses less digits than its factorization.

2271865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4139.

The product of its digits is 6720, while the sum is 31.

The square root of 2271865 is about 1507.2707122478. The cubic root of 2271865 is about 131.4601651812.

It can be divided in two parts, 2271 and 865, that added together give a square (3136 = 56²).

The spelling of 2271865 in words is "two million, two hundred seventy-one thousand, eight hundred sixty-five".