2144561 has 4 divisors (see below), whose sum is σ = 2148900. Its totient is φ = 2140224.

The previous prime is 2144551. The next prime is 2144609. The reversal of 2144561 is 1654412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1062961 + 1081600 = 1031^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144561 - 2¹⁴ = 2128177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2144501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1316 + ... + 2453.

It is an arithmetic number, because the mean of its divisors is an integer number (537225).

2^2144561 is an apocalyptic number.

It is an amenable number.

2144561 is a deficient number, since it is larger than the sum of its proper divisors (4339).

2144561 is an equidigital number, since it uses as much as digits as its factorization.

2144561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4338.

The product of its digits is 960, while the sum is 23.

The square root of 2144561 is about 1464.4319717897. The cubic root of 2144561 is about 128.9573602639.

Adding to 2144561 its reverse (1654412), we get a palindrome (3798973).

The spelling of 2144561 in words is "two million, one hundred forty-four thousand, five hundred sixty-one".