42145543 has 4 divisors (see below), whose sum is σ = 45976968. Its totient is φ = 38314120.

The previous prime is 42145541. The next prime is 42145549. The reversal of 42145543 is 34554124.

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 42145543 - 2¹ = 42145541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42145541) 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, 1915696 + ... + 1915717.

It is an arithmetic number, because the mean of its divisors is an integer number (11494242).

Almost surely, 2^42145543 is an apocalyptic number.

42145543 is a deficient number, since it is larger than the sum of its proper divisors (3831425).

42145543 is a wasteful number, since it uses less digits than its factorization.

42145543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3831424.

The product of its digits is 9600, while the sum is 28.

The square root of 42145543 is about 6491.9598735667. The cubic root of 42145543 is about 348.0037185272.

Adding to 42145543 its reverse (34554124), we get a palindrome (76699667).

The spelling of 42145543 in words is "forty-two million, one hundred forty-five thousand, five hundred forty-three".