2271645 has 40 divisors (see below), whose sum is σ = 4181760. Its totient is φ = 1179360.

The previous prime is 2271637. The next prime is 2271673. The reversal of 2271645 is 5461722.

2271645 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 2271645 - 2³ = 2271637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 28716 + ... + 28794.

It is an arithmetic number, because the mean of its divisors is an integer number (104544).

2^2271645 is an apocalyptic number.

It is an amenable number.

2271645 is a deficient number, since it is larger than the sum of its proper divisors (1910115).

2271645 is an equidigital number, since it uses as much as digits as its factorization.

2271645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 158 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2271645 is about 1507.1977308900. The cubic root of 2271645 is about 131.4559216530.

It can be divided in two parts, 2271 and 645, that added together give a square (2916 = 54²).

The spelling of 2271645 in words is "two million, two hundred seventy-one thousand, six hundred forty-five".