170161 has 4 divisors (see below), whose sum is σ = 171072. Its totient is φ = 169252.

The previous prime is 170141. The next prime is 170167. The reversal of 170161 is 161071.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 170161 - 2⁹ = 169649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61 + ... + 586.

It is an arithmetic number, because the mean of its divisors is an integer number (42768).

2¹⁷⁰¹⁶¹ is an apocalyptic number.

It is an amenable number.

170161 is a deficient number, since it is larger than the sum of its proper divisors (911).

170161 is an equidigital number, since it uses as much as digits as its factorization.

170161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 170161 is about 412.5057575356. The cubic root of 170161 is about 55.4140649905.

The spelling of 170161 in words is "one hundred seventy thousand, one hundred sixty-one".