217991114 has 16 divisors (see below), whose sum is σ = 357327936. Its totient is φ = 98916000.

The previous prime is 217991113. The next prime is 217991129. The reversal of 217991114 is 411199712.

It is not an unprimeable number, because it can be changed into a prime (217991113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4979 + ... + 21465.

It is an arithmetic number, because the mean of its divisors is an integer number (22332996).

Almost surely, 2^217991114 is an apocalyptic number.

217991114 is a deficient number, since it is larger than the sum of its proper divisors (139336822).

217991114 is a wasteful number, since it uses less digits than its factorization.

217991114 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17101.

The product of its digits is 4536, while the sum is 35.

The square root of 217991114 is about 14764.5221392363. The cubic root of 217991114 is about 601.8379879918.

The spelling of 217991114 in words is "two hundred seventeen million, nine hundred ninety-one thousand, one hundred fourteen".