42172571 has 8 divisors (see below), whose sum is σ = 50734080. Its totient is φ = 34245288.

The previous prime is 42172541. The next prime is 42172591. The reversal of 42172571 is 17527124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-42172571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42172511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158411 + ... + 158676.

It is an arithmetic number, because the mean of its divisors is an integer number (6341760).

Almost surely, 2^42172571 is an apocalyptic number.

42172571 is a deficient number, since it is larger than the sum of its proper divisors (8561509).

42172571 is a wasteful number, since it uses less digits than its factorization.

42172571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317113.

The product of its digits is 3920, while the sum is 29.

The square root of 42172571 is about 6494.0411917388. The cubic root of 42172571 is about 348.0780943994.

Adding to 42172571 its reverse (17527124), we get a palindrome (59699695).

The spelling of 42172571 in words is "forty-two million, one hundred seventy-two thousand, five hundred seventy-one".