170105987 has 8 divisors (see below), whose sum is σ = 173126256. Its totient is φ = 167104512.

The previous prime is 170105951. The next prime is 170106011. The reversal of 170105987 is 789501071.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 170105987 - 2⁸ = 170105731 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 170105987.

It is not an unprimeable number, because it can be changed into a prime (170105087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14228 + ... + 23294.

It is an arithmetic number, because the mean of its divisors is an integer number (21640782).

Almost surely, 2^170105987 is an apocalyptic number.

170105987 is a deficient number, since it is larger than the sum of its proper divisors (3020269).

170105987 is an equidigital number, since it uses as much as digits as its factorization.

170105987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9397.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 170105987 is about 13042.4685930233. The cubic root of 170105987 is about 554.0809256334.

The spelling of 170105987 in words is "one hundred seventy million, one hundred five thousand, nine hundred eighty-seven".