170216987 has 4 divisors (see below), whose sum is σ = 170361576. Its totient is φ = 170072400.

The previous prime is 170216923. The next prime is 170216989. The reversal of 170216987 is 789612071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789612071 = 41 ⋅19258831.

It is a cyclic number.

It is not a de Polignac number, because 170216987 - 2⁶ = 170216923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170216989) 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, 70514 + ... + 72887.

It is an arithmetic number, because the mean of its divisors is an integer number (42590394).

Almost surely, 2^170216987 is an apocalyptic number.

170216987 is a deficient number, since it is larger than the sum of its proper divisors (144589).

170216987 is a wasteful number, since it uses less digits than its factorization.

170216987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144588.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 170216987 is about 13046.7232284586. The cubic root of 170216987 is about 554.2014183746.

The spelling of 170216987 in words is "one hundred seventy million, two hundred sixteen thousand, nine hundred eighty-seven".