84159871 has 2 divisors, whose sum is σ = 84159872. Its totient is φ = 84159870.

The previous prime is 84159869. The next prime is 84159917. The reversal of 84159871 is 17895148.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84159871 - 2¹ = 84159869 is a prime.

Together with 84159869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84159841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42079935 + 42079936.

It is an arithmetic number, because the mean of its divisors is an integer number (42079936).

Almost surely, 2^84159871 is an apocalyptic number.

84159871 is a deficient number, since it is larger than the sum of its proper divisors (1).

84159871 is an equidigital number, since it uses as much as digits as its factorization.

84159871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 43.

The square root of 84159871 is about 9173.8689221070. The cubic root of 84159871 is about 438.2295784281.

The spelling of 84159871 in words is "eighty-four million, one hundred fifty-nine thousand, eight hundred seventy-one".