217110897 has 6 divisors (see below), whose sum is σ = 313604642. Its totient is φ = 144740592.

The previous prime is 217110877. The next prime is 217110899. The reversal of 217110897 is 798011712.

It can be written as a sum of positive squares in only one way, i.e., 216796176 + 314721 = 14724^2 + 561^2 .

It is not a de Polignac number, because 217110897 - 2⁷ = 217110769 is a prime.

It is a super-2 number, since 2×217110897² = 94274283192289218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217110899) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12061708 + ... + 12061725.

Almost surely, 2^217110897 is an apocalyptic number.

It is an amenable number.

217110897 is a deficient number, since it is larger than the sum of its proper divisors (96493745).

217110897 is a wasteful number, since it uses less digits than its factorization.

217110897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24123439 (or 24123436 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 217110897 is about 14734.6834713203. The cubic root of 217110897 is about 601.0268499627.

The spelling of 217110897 in words is "two hundred seventeen million, one hundred ten thousand, eight hundred ninety-seven".