42440161 has 2 divisors, whose sum is σ = 42440162. Its totient is φ = 42440160.

The previous prime is 42440149. The next prime is 42440173. The reversal of 42440161 is 16104424.

42440161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (42440149) and next prime (42440173).

It can be written as a sum of positive squares in only one way, i.e., 32947600 + 9492561 = 5740^2 + 3081^2 .

It is a cyclic number.

It is not a de Polignac number, because 42440161 - 2¹¹ = 42438113 is a prime.

It is not a weakly prime, because it can be changed into another prime (42440191) 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, 21220080 + 21220081.

It is an arithmetic number, because the mean of its divisors is an integer number (21220081).

Almost surely, 2^42440161 is an apocalyptic number.

It is an amenable number.

42440161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42440161 is an equidigital number, since it uses as much as digits as its factorization.

42440161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 42440161 is about 6514.6113468111. The cubic root of 42440161 is about 348.8127418025.

Adding to 42440161 its reverse (16104424), we get a palindrome (58544585).

The spelling of 42440161 in words is "forty-two million, four hundred forty thousand, one hundred sixty-one".