84505871 has 4 divisors (see below), whose sum is σ = 84535752. Its totient is φ = 84475992.

The previous prime is 84505867. The next prime is 84505919. The reversal of 84505871 is 17850548.

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 84505871 - 2² = 84505867 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 (84505831) 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 3 ways as a sum of consecutive naturals, for example, 10196 + ... + 16521.

It is an arithmetic number, because the mean of its divisors is an integer number (21133938).

Almost surely, 2^84505871 is an apocalyptic number.

84505871 is a deficient number, since it is larger than the sum of its proper divisors (29881).

84505871 is a wasteful number, since it uses less digits than its factorization.

84505871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29880.

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 84505871 is about 9192.7074901794. The cubic root of 84505871 is about 438.8293104787.

The spelling of 84505871 in words is "eighty-four million, five hundred five thousand, eight hundred seventy-one".