171278543 has 2 divisors, whose sum is σ = 171278544. Its totient is φ = 171278542.

The previous prime is 171278531. The next prime is 171278581. The reversal of 171278543 is 345872171.

It is an a-pointer prime, because the next prime (171278581) can be obtained adding 171278543 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 171278543 - 2²⁶ = 104169679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 171278497 and 171278506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (179278543) 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 as a sum of consecutive naturals, namely, 85639271 + 85639272.

It is an arithmetic number, because the mean of its divisors is an integer number (85639272).

Almost surely, 2^171278543 is an apocalyptic number.

171278543 is a deficient number, since it is larger than the sum of its proper divisors (1).

171278543 is an equidigital number, since it uses as much as digits as its factorization.

171278543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47040, while the sum is 38.

The square root of 171278543 is about 13087.3428548350. The cubic root of 171278543 is about 555.3511215918.

The spelling of 171278543 in words is "one hundred seventy-one million, two hundred seventy-eight thousand, five hundred forty-three".