42161845 has 24 divisors (see below), whose sum is σ = 56038752. Its totient is φ = 30428640.

The previous prime is 42161843. The next prime is 42161849. The reversal of 42161845 is 54816124.

42161845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42161845 - 2¹ = 42161843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42161843) 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 23 ways as a sum of consecutive naturals, for example, 137182 + ... + 137488.

It is an arithmetic number, because the mean of its divisors is an integer number (2334948).

Almost surely, 2^42161845 is an apocalyptic number.

It is an amenable number.

42161845 is a deficient number, since it is larger than the sum of its proper divisors (13876907).

42161845 is a wasteful number, since it uses less digits than its factorization.

42161845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 550 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 42161845 is about 6493.2153052244. The cubic root of 42161845 is about 348.0485823089.

Adding to 42161845 its reverse (54816124), we get a palindrome (96977969).

The spelling of 42161845 in words is "forty-two million, one hundred sixty-one thousand, eight hundred forty-five".