42561171 has 24 divisors (see below), whose sum is σ = 64296960. Its totient is φ = 27097200.

The previous prime is 42561143. The next prime is 42561187. The reversal of 42561171 is 17116524.

It is a happy number.

42561171 is a `hidden beast` number, since 42 + 5 + 611 + 7 + 1 = 666.

42561171 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 42561171 - 2⁵ = 42561139 is a prime.

It is a super-2 number, since 2×42561171² = 3622906553782482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42561131) 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, 21076 + ... + 23006.

It is an arithmetic number, because the mean of its divisors is an integer number (2679040).

Almost surely, 2^42561171 is an apocalyptic number.

42561171 is a deficient number, since it is larger than the sum of its proper divisors (21735789).

42561171 is a wasteful number, since it uses less digits than its factorization.

42561171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047 (or 2044 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 42561171 is about 6523.8923197735. The cubic root of 42561171 is about 349.1439514756.

Adding to 42561171 its reverse (17116524), we get a palindrome (59677695).

The spelling of 42561171 in words is "forty-two million, five hundred sixty-one thousand, one hundred seventy-one".