216814917 has 8 divisors (see below), whose sum is σ = 315367200. Its totient is φ = 131402960.

The previous prime is 216814883. The next prime is 216814919. The reversal of 216814917 is 719418612.

216814917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216814917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216814919) 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, 3285042 + ... + 3285107.

It is an arithmetic number, because the mean of its divisors is an integer number (39420900).

Almost surely, 2^216814917 is an apocalyptic number.

It is an amenable number.

216814917 is a deficient number, since it is larger than the sum of its proper divisors (98552283).

216814917 is a wasteful number, since it uses less digits than its factorization.

216814917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6570163.

The product of its digits is 24192, while the sum is 39.

The square root of 216814917 is about 14724.6363961899. The cubic root of 216814917 is about 600.7536058452.

The spelling of 216814917 in words is "two hundred sixteen million, eight hundred fourteen thousand, nine hundred seventeen".