42009171 has 16 divisors (see below), whose sum is σ = 60556800. Its totient is φ = 25813728.

The previous prime is 42009169. The next prime is 42009173. The reversal of 42009171 is 17190024.

It is an interprime number because it is at equal distance from previous prime (42009169) and next prime (42009173).

It is not a de Polignac number, because 42009171 - 2¹ = 42009169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42009173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7851 + ... + 12068.

It is an arithmetic number, because the mean of its divisors is an integer number (3784800).

Almost surely, 2^42009171 is an apocalyptic number.

42009171 is a deficient number, since it is larger than the sum of its proper divisors (18547629).

42009171 is a wasteful number, since it uses less digits than its factorization.

42009171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19978.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 42009171 is about 6481.4482177982. The cubic root of 42009171 is about 347.6279631556.

Adding to 42009171 its reverse (17190024), we get a palindrome (59199195).

The spelling of 42009171 in words is "forty-two million, nine thousand, one hundred seventy-one".