170209117 has 8 divisors (see below), whose sum is σ = 194084856. Its totient is φ = 147873792.

The previous prime is 170209111. The next prime is 170209121. The reversal of 170209117 is 711902071.

It can be written as a sum of positive squares in 4 ways, for example, as 454276 + 169754841 = 674^2 + 13029^2 .

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 170209117 - 2⁷ = 170208989 is a prime.

It is a super-2 number, since 2×170209117² = 57942287019839378, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170209111) 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, 384868 + ... + 385309.

It is an arithmetic number, because the mean of its divisors is an integer number (24260607).

Almost surely, 2^170209117 is an apocalyptic number.

170209117 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

170209117 is a deficient number, since it is larger than the sum of its proper divisors (23875739).

170209117 is a wasteful number, since it uses less digits than its factorization.

170209117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770207.

The product of its (nonzero) digits is 882, while the sum is 28.

The square root of 170209117 is about 13046.4216166733. The cubic root of 170209117 is about 554.1928770563.

The spelling of 170209117 in words is "one hundred seventy million, two hundred nine thousand, one hundred seventeen".