217118097 has 16 divisors (see below), whose sum is σ = 367607680. Its totient is φ = 124067376.

The previous prime is 217118089. The next prime is 217118113. The reversal of 217118097 is 790811712.

It is not a de Polignac number, because 217118097 - 2³ = 217118089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217118047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574198 + ... + 574575.

It is an arithmetic number, because the mean of its divisors is an integer number (22975480).

Almost surely, 2^217118097 is an apocalyptic number.

217118097 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

217118097 is a deficient number, since it is larger than the sum of its proper divisors (150489583).

217118097 is a wasteful number, since it uses less digits than its factorization.

217118097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148789 (or 1148783 counting only the distinct ones).

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

The square root of 217118097 is about 14734.9277907969. The cubic root of 217118097 is about 601.0334937955.

The spelling of 217118097 in words is "two hundred seventeen million, one hundred eighteen thousand, ninety-seven".