41215561 has 2 divisors, whose sum is σ = 41215562. Its totient is φ = 41215560.

The previous prime is 41215549. The next prime is 41215589. The reversal of 41215561 is 16551214.

It is a happy number.

41215561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39879225 + 1336336 = 6315^2 + 1156^2 .

It is a cyclic number.

It is not a de Polignac number, because 41215561 - 2¹⁵ = 41182793 is a prime.

It is not a weakly prime, because it can be changed into another prime (41215501) 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, 20607780 + 20607781.

It is an arithmetic number, because the mean of its divisors is an integer number (20607781).

Almost surely, 2^41215561 is an apocalyptic number.

It is an amenable number.

41215561 is a deficient number, since it is larger than the sum of its proper divisors (1).

41215561 is an equidigital number, since it uses as much as digits as its factorization.

41215561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 41215561 is about 6419.9346569883. The cubic root of 41215561 is about 345.4249779340.

Adding to 41215561 its reverse (16551214), we get a palindrome (57766775).

The spelling of 41215561 in words is "forty-one million, two hundred fifteen thousand, five hundred sixty-one".