84171487 has 4 divisors (see below), whose sum is σ = 84570616. Its totient is φ = 83772360.

The previous prime is 84171457. The next prime is 84171491. The reversal of 84171487 is 78417148.

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 84171487 - 2¹¹ = 84169439 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 (84171457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199248 + ... + 199669.

It is an arithmetic number, because the mean of its divisors is an integer number (21142654).

Almost surely, 2^84171487 is an apocalyptic number.

84171487 is a deficient number, since it is larger than the sum of its proper divisors (399129).

84171487 is a wasteful number, since it uses less digits than its factorization.

84171487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399128.

The product of its digits is 50176, while the sum is 40.

The square root of 84171487 is about 9174.5020028337. The cubic root of 84171487 is about 438.2497394246.

The spelling of 84171487 in words is "eighty-four million, one hundred seventy-one thousand, four hundred eighty-seven".