4042561 has 2 divisors, whose sum is σ = 4042562. Its totient is φ = 4042560.

The previous prime is 4042547. The next prime is 4042601. The reversal of 4042561 is 1652404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3682561 + 360000 = 1919^2 + 600^2 .

It is a cyclic number.

It is not a de Polignac number, because 4042561 - 2⁷ = 4042433 is a prime.

It is not a weakly prime, because it can be changed into another prime (4042501) 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 as a sum of consecutive naturals, namely, 2021280 + 2021281.

It is an arithmetic number, because the mean of its divisors is an integer number (2021281).

Almost surely, 2^4042561 is an apocalyptic number.

It is an amenable number.

4042561 is a deficient number, since it is larger than the sum of its proper divisors (1).

4042561 is an equidigital number, since it uses as much as digits as its factorization.

4042561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 4042561 is about 2010.6120958554. The cubic root of 4042561 is about 159.3011315249.

Adding to 4042561 its reverse (1652404), we get a palindrome (5694965).

The spelling of 4042561 in words is "four million, forty-two thousand, five hundred sixty-one".