216634243 has 12 divisors (see below), whose sum is σ = 252841512. Its totient is φ = 185068800.

The previous prime is 216634207. The next prime is 216634259. The reversal of 216634243 is 342436612.

216634243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216634243 - 2⁹ = 216633731 is a prime.

It is the 14719-th Hogben number.

It is not an unprimeable number, because it can be changed into a prime (216634273) by changing a digit.

It is a nontrivial repunit in base 14718.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7843 + ... + 22243.

It is an arithmetic number, because the mean of its divisors is an integer number (21070126).

Almost surely, 2^216634243 is an apocalyptic number.

216634243 is a deficient number, since it is larger than the sum of its proper divisors (36207269).

216634243 is a wasteful number, since it uses less digits than its factorization.

216634243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14722 (or 14715 counting only the distinct ones).

The product of its digits is 20736, while the sum is 31.

The square root of 216634243 is about 14718.5000254781. The cubic root of 216634243 is about 600.5866881784.

The spelling of 216634243 in words is "two hundred sixteen million, six hundred thirty-four thousand, two hundred forty-three".