170970209 has 4 divisors (see below), whose sum is σ = 174196116. Its totient is φ = 167744304.

The previous prime is 170970187. The next prime is 170970221. The reversal of 170970209 is 902079071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 902079071 = 2647 ⋅340793.

It can be written as a sum of positive squares in 2 ways, for example, as 126787600 + 44182609 = 11260^2 + 6647^2 .

It is a cyclic number.

It is not a de Polignac number, because 170970209 - 2¹² = 170966113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (170970409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1612874 + ... + 1612979.

It is an arithmetic number, because the mean of its divisors is an integer number (43549029).

Almost surely, 2^170970209 is an apocalyptic number.

It is an amenable number.

170970209 is a deficient number, since it is larger than the sum of its proper divisors (3225907).

170970209 is an equidigital number, since it uses as much as digits as its factorization.

170970209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3225906.

The product of its (nonzero) digits is 7938, while the sum is 35.

The square root of 170970209 is about 13075.5576936512. The cubic root of 170970209 is about 555.0176754915.

The spelling of 170970209 in words is "one hundred seventy million, nine hundred seventy thousand, two hundred nine".