42085543 has 2 divisors, whose sum is σ = 42085544. Its totient is φ = 42085542.

The previous prime is 42085517. The next prime is 42085553. The reversal of 42085543 is 34558024.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42085543 - 2²¹ = 39988391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42085553) 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, 21042771 + 21042772.

It is an arithmetic number, because the mean of its divisors is an integer number (21042772).

Almost surely, 2^42085543 is an apocalyptic number.

42085543 is a deficient number, since it is larger than the sum of its proper divisors (1).

42085543 is an equidigital number, since it uses as much as digits as its factorization.

42085543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 42085543 is about 6487.3371270499. The cubic root of 42085543 is about 347.8384963147.

The spelling of 42085543 in words is "forty-two million, eighty-five thousand, five hundred forty-three".