171487 has 4 divisors (see below), whose sum is σ = 172480. Its totient is φ = 170496.

The previous prime is 171481. The next prime is 171491. The reversal of 171487 is 784171.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171487 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171481) 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, 162 + ... + 607.

It is an arithmetic number, because the mean of its divisors is an integer number (43120).

2¹⁷¹⁴⁸⁷ is an apocalyptic number.

171487 is a deficient number, since it is larger than the sum of its proper divisors (993).

171487 is an equidigital number, since it uses as much as digits as its factorization.

171487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992.

The product of its digits is 1568, while the sum is 28.

The square root of 171487 is about 414.1098887976. The cubic root of 171487 is about 55.5576329594.

The spelling of 171487 in words is "one hundred seventy-one thousand, four hundred eighty-seven".