41642561 has 4 divisors (see below), whose sum is σ = 41655492. Its totient is φ = 41629632.

The previous prime is 41642551. The next prime is 41642567. The reversal of 41642561 is 16524614.

41642561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 16200625 + 25441936 = 4025^2 + 5044^2 .

It is a cyclic number.

It is not a de Polignac number, because 41642561 - 2¹⁴ = 41626177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (41642567) 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 3 ways as a sum of consecutive naturals, for example, 2645 + ... + 9501.

It is an arithmetic number, because the mean of its divisors is an integer number (10413873).

Almost surely, 2^41642561 is an apocalyptic number.

It is an amenable number.

41642561 is a deficient number, since it is larger than the sum of its proper divisors (12931).

41642561 is an equidigital number, since it uses as much as digits as its factorization.

41642561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12930.

The product of its digits is 5760, while the sum is 29.

The square root of 41642561 is about 6453.1047566268. The cubic root of 41642561 is about 346.6137685353.

The spelling of 41642561 in words is "forty-one million, six hundred forty-two thousand, five hundred sixty-one".