216651843 has 12 divisors (see below), whose sum is σ = 314058888. Its totient is φ = 143918880.

The previous prime is 216651821. The next prime is 216651847. The reversal of 216651843 is 348156612.

It is a happy number.

216651843 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 216651843 - 2²⁶ = 149542979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216651798 and 216651807.

It is not an unprimeable number, because it can be changed into a prime (216651847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40305 + ... + 45362.

It is an arithmetic number, because the mean of its divisors is an integer number (26171574).

Almost surely, 2^216651843 is an apocalyptic number.

216651843 is a deficient number, since it is larger than the sum of its proper divisors (97407045).

216651843 is a wasteful number, since it uses less digits than its factorization.

216651843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85954 (or 85951 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 216651843 is about 14719.0979003470. The cubic root of 216651843 is about 600.6029522114.

The spelling of 216651843 in words is "two hundred sixteen million, six hundred fifty-one thousand, eight hundred forty-three".