42142871 has 2 divisors, whose sum is σ = 42142872. Its totient is φ = 42142870.

The previous prime is 42142853. The next prime is 42142873. The reversal of 42142871 is 17824124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42142871 is a prime.

It is a super-2 number, since 2×42142871² = 3552043152245282, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 42142873, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42142873) 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 as a sum of consecutive naturals, namely, 21071435 + 21071436.

It is an arithmetic number, because the mean of its divisors is an integer number (21071436).

Almost surely, 2^42142871 is an apocalyptic number.

42142871 is a deficient number, since it is larger than the sum of its proper divisors (1).

42142871 is an equidigital number, since it uses as much as digits as its factorization.

42142871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 29.

The square root of 42142871 is about 6491.7540772891. The cubic root of 42142871 is about 347.9963639687.

Adding to 42142871 its reverse (17824124), we get a palindrome (59966995).

The spelling of 42142871 in words is "forty-two million, one hundred forty-two thousand, eight hundred seventy-one".