42561971 has 2 divisors, whose sum is σ = 42561972. Its totient is φ = 42561970.

The previous prime is 42561941. The next prime is 42561989. The reversal of 42561971 is 17916524.

42561971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42561971 - 2⁶ = 42561907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42561901) 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, 21280985 + 21280986.

It is an arithmetic number, because the mean of its divisors is an integer number (21280986).

Almost surely, 2^42561971 is an apocalyptic number.

42561971 is a deficient number, since it is larger than the sum of its proper divisors (1).

42561971 is an equidigital number, since it uses as much as digits as its factorization.

42561971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 42561971 is about 6523.9536325759. The cubic root of 42561971 is about 349.1461390205.

The spelling of 42561971 in words is "forty-two million, five hundred sixty-one thousand, nine hundred seventy-one".