42171545 has 16 divisors (see below), whose sum is σ = 57368640. Its totient is φ = 29502144.

The previous prime is 42171541. The next prime is 42171551. The reversal of 42171545 is 54517124.

42171545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42171545 - 2² = 42171541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42171541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15839 + ... + 18308.

It is an arithmetic number, because the mean of its divisors is an integer number (3585540).

Almost surely, 2^42171545 is an apocalyptic number.

It is an amenable number.

42171545 is a deficient number, since it is larger than the sum of its proper divisors (15197095).

42171545 is a wasteful number, since it uses less digits than its factorization.

42171545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34184.

The product of its digits is 5600, while the sum is 29.

The square root of 42171545 is about 6493.9621957631. The cubic root of 42171545 is about 348.0752716246.

Adding to 42171545 its reverse (54517124), we get a palindrome (96688669).

The spelling of 42171545 in words is "forty-two million, one hundred seventy-one thousand, five hundred forty-five".