4043561 has 12 divisors (see below), whose sum is σ = 4462272. Its totient is φ = 3656664.

The previous prime is 4043549. The next prime is 4043587. The reversal of 4043561 is 1653404.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-4043561 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4043761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8060 + ... + 8546.

It is an arithmetic number, because the mean of its divisors is an integer number (371856).

Almost surely, 2^4043561 is an apocalyptic number.

It is an amenable number.

4043561 is a deficient number, since it is larger than the sum of its proper divisors (418711).

4043561 is a wasteful number, since it uses less digits than its factorization.

4043561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 4043561 is about 2010.8607609678. The cubic root of 4043561 is about 159.3142657730.

Adding to 4043561 its reverse (1653404), we get a palindrome (5696965).

The spelling of 4043561 in words is "four million, forty-three thousand, five hundred sixty-one".