42109271 has 2 divisors, whose sum is σ = 42109272. Its totient is φ = 42109270.

The previous prime is 42109267. The next prime is 42109283. The reversal of 42109271 is 17290124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42109271 - 2² = 42109267 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42109271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42109201) 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, 21054635 + 21054636.

It is an arithmetic number, because the mean of its divisors is an integer number (21054636).

Almost surely, 2^42109271 is an apocalyptic number.

42109271 is a deficient number, since it is larger than the sum of its proper divisors (1).

42109271 is an equidigital number, since it uses as much as digits as its factorization.

42109271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 42109271 is about 6489.1656628568. The cubic root of 42109271 is about 347.9038549519.

Adding to 42109271 its reverse (17290124), we get a palindrome (59399395).

The spelling of 42109271 in words is "forty-two million, one hundred nine thousand, two hundred seventy-one".