42171571 has 4 divisors (see below), whose sum is σ = 45415552. Its totient is φ = 38927592.

The previous prime is 42171551. The next prime is 42171617. The reversal of 42171571 is 17517124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42171571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42171511) 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, 1621971 + ... + 1621996.

It is an arithmetic number, because the mean of its divisors is an integer number (11353888).

Almost surely, 2^42171571 is an apocalyptic number.

42171571 is a deficient number, since it is larger than the sum of its proper divisors (3243981).

42171571 is a wasteful number, since it uses less digits than its factorization.

42171571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243980.

The product of its digits is 1960, while the sum is 28.

The square root of 42171571 is about 6493.9641976223. The cubic root of 42171571 is about 348.0753431574.

Adding to 42171571 its reverse (17517124), we get a palindrome (59688695).

The spelling of 42171571 in words is "forty-two million, one hundred seventy-one thousand, five hundred seventy-one".