42171671 has 4 divisors (see below), whose sum is σ = 42645600. Its totient is φ = 41697744.

The previous prime is 42171631. The next prime is 42171677. The reversal of 42171671 is 17617124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42171671 - 2²² = 37977367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42171677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236831 + ... + 237008.

It is an arithmetic number, because the mean of its divisors is an integer number (10661400).

Almost surely, 2^42171671 is an apocalyptic number.

42171671 is a deficient number, since it is larger than the sum of its proper divisors (473929).

42171671 is an equidigital number, since it uses as much as digits as its factorization.

42171671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473928.

The product of its digits is 2352, while the sum is 29.

The square root of 42171671 is about 6493.9718970750. The cubic root of 42171671 is about 348.0756182836.

Adding to 42171671 its reverse (17617124), we get a palindrome (59788795).

The spelling of 42171671 in words is "forty-two million, one hundred seventy-one thousand, six hundred seventy-one".