171042543 has 16 divisors (see below), whose sum is σ = 289596160. Its totient is φ = 97738488.

The previous prime is 171042533. The next prime is 171042581. The reversal of 171042543 is 345240171.

171042543 is a `hidden beast` number, since 17 + 104 + 2 + 543 = 666.

It is not a de Polignac number, because 171042543 - 2¹⁴ = 171026159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171042523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452305 + ... + 452682.

It is an arithmetic number, because the mean of its divisors is an integer number (18099760).

Almost surely, 2^171042543 is an apocalyptic number.

171042543 is a deficient number, since it is larger than the sum of its proper divisors (118553617).

171042543 is an equidigital number, since it uses as much as digits as its factorization.

171042543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905003 (or 904997 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 171042543 is about 13078.3234017209. The cubic root of 171042543 is about 555.0959366661.

It can be divided in two parts, 1710 and 42543, that added together give a triangular number (44253 = T₂₉₇).

The spelling of 171042543 in words is "one hundred seventy-one million, forty-two thousand, five hundred forty-three".