170642161 has 2 divisors, whose sum is σ = 170642162. Its totient is φ = 170642160.

The previous prime is 170642159. The next prime is 170642179. The reversal of 170642161 is 161246071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111429136 + 59213025 = 10556^2 + 7695^2 .

It is a cyclic number.

It is not a de Polignac number, because 170642161 - 2¹ = 170642159 is a prime.

It is a super-2 number, since 2×170642161² = 58237494221499842, which contains 22 as substring.

Together with 170642159, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (170642111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85321080 + 85321081.

It is an arithmetic number, because the mean of its divisors is an integer number (85321081).

Almost surely, 2^170642161 is an apocalyptic number.

It is an amenable number.

170642161 is a deficient number, since it is larger than the sum of its proper divisors (1).

170642161 is an equidigital number, since it uses as much as digits as its factorization.

170642161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 170642161 is about 13063.0073489989. The cubic root of 170642161 is about 554.6624693343.

The spelling of 170642161 in words is "one hundred seventy million, six hundred forty-two thousand, one hundred sixty-one".