42971 has 4 divisors (see below), whose sum is σ = 43512. Its totient is φ = 42432.

The previous prime is 42967. The next prime is 42979. The reversal of 42971 is 17924.

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 42971 - 2² = 42967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125 + ... + 318.

It is an arithmetic number, because the mean of its divisors is an integer number (10878).

2⁴²⁹⁷¹ is an apocalyptic number.

42971 is a deficient number, since it is larger than the sum of its proper divisors (541).

42971 is an equidigital number, since it uses as much as digits as its factorization.

42971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540.

The product of its digits is 504, while the sum is 23.

The square root of 42971 is about 207.2944765304. The cubic root of 42971 is about 35.0261029766.

The spelling of 42971 in words is "forty-two thousand, nine hundred seventy-one".