171220285 has 16 divisors (see below), whose sum is σ = 214663680. Its totient is φ = 130950720.

The previous prime is 171220249. The next prime is 171220289. The reversal of 171220285 is 582022171.

It is not a de Polignac number, because 171220285 - 2²¹ = 169123133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171220289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6211 + ... + 19519.

It is an arithmetic number, because the mean of its divisors is an integer number (13416480).

Almost surely, 2^171220285 is an apocalyptic number.

It is an amenable number.

171220285 is a deficient number, since it is larger than the sum of its proper divisors (43443395).

171220285 is a wasteful number, since it uses less digits than its factorization.

171220285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13428.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 171220285 is about 13085.1169272575. The cubic root of 171220285 is about 555.2881494802.

The spelling of 171220285 in words is "one hundred seventy-one million, two hundred twenty thousand, two hundred eighty-five".