216606249 has 24 divisors (see below), whose sum is σ = 337746240. Its totient is φ = 133359072.

The previous prime is 216606241. The next prime is 216606253. The reversal of 216606249 is 942606612.

216606249 is a `hidden beast` number, since 2 + 1 + 6 + 606 + 2 + 49 = 666.

It is not a de Polignac number, because 216606249 - 2³ = 216606241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216606241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12039 + ... + 24044.

It is an arithmetic number, because the mean of its divisors is an integer number (14072760).

Almost surely, 2^216606249 is an apocalyptic number.

216606249 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

216606249 is a deficient number, since it is larger than the sum of its proper divisors (121139991).

216606249 is a wasteful number, since it uses less digits than its factorization.

216606249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36141 (or 36138 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 216606249 is about 14717.5490146967. The cubic root of 216606249 is about 600.5608173099.

The spelling of 216606249 in words is "two hundred sixteen million, six hundred six thousand, two hundred forty-nine".