84871505 has 4 divisors (see below), whose sum is σ = 101845812. Its totient is φ = 67897200.

The previous prime is 84871481. The next prime is 84871573. The reversal of 84871505 is 50517848.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51509329 + 33362176 = 7177^2 + 5776^2 .

It is not a de Polignac number, because 84871505 - 2¹⁸ = 84609361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8487146 + ... + 8487155.

It is an arithmetic number, because the mean of its divisors is an integer number (25461453).

Almost surely, 2^84871505 is an apocalyptic number.

It is an amenable number.

84871505 is a deficient number, since it is larger than the sum of its proper divisors (16974307).

84871505 is a wasteful number, since it uses less digits than its factorization.

84871505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16974306.

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

The square root of 84871505 is about 9212.5732018801. The cubic root of 84871505 is about 439.4612983696.

The spelling of 84871505 in words is "eighty-four million, eight hundred seventy-one thousand, five hundred five".