171284985 has 12 divisors (see below), whose sum is σ = 296894052. Its totient is φ = 91351968.

The previous prime is 171284963. The next prime is 171284987. The reversal of 171284985 is 589482171.

It can be written as a sum of positive squares in 2 ways, for example, as 123010281 + 48274704 = 11091^2 + 6948^2 .

It is not a de Polignac number, because 171284985 - 2⁷ = 171284857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 3806333 = 171284985 / (1 + 7 + 1 + 2 + 8 + 4 + 9 + 8 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 171284985.

It is not an unprimeable number, because it can be changed into a prime (171284987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1903122 + ... + 1903211.

It is an arithmetic number, because the mean of its divisors is an integer number (24741171).

Almost surely, 2^171284985 is an apocalyptic number.

171284985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

171284985 is a deficient number, since it is larger than the sum of its proper divisors (125609067).

171284985 is a wasteful number, since it uses less digits than its factorization.

171284985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3806344 (or 3806341 counting only the distinct ones).

The product of its digits is 161280, while the sum is 45.

The square root of 171284985 is about 13087.5889681790. The cubic root of 171284985 is about 555.3580839877.

It can be divided in two parts, 171 and 284985, that added together give a square (285156 = 534²).

The spelling of 171284985 in words is "one hundred seventy-one million, two hundred eighty-four thousand, nine hundred eighty-five".