170689 has 2 divisors, whose sum is σ = 170690. Its totient is φ = 170688.

The previous prime is 170669. The next prime is 170701. The reversal of 170689 is 986071.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166464 + 4225 = 408^2 + 65^2 .

It is an emirp because it is prime and its reverse (986071) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170689 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 170689.

It is not a weakly prime, because it can be changed into another prime (170609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85344 + 85345.

It is an arithmetic number, because the mean of its divisors is an integer number (85345).

2¹⁷⁰⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

170689 is a deficient number, since it is larger than the sum of its proper divisors (1).

170689 is an equidigital number, since it uses as much as digits as its factorization.

170689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 170689 is about 413.1452529075. The cubic root of 170689 is about 55.4713213845.

The spelling of 170689 in words is "one hundred seventy thousand, six hundred eighty-nine".