216812789 has 4 divisors (see below), whose sum is σ = 226239456. Its totient is φ = 207386124.

The previous prime is 216812779. The next prime is 216812801. The reversal of 216812789 is 987218612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 216812789 - 2¹⁶ = 216747253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216812759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4713299 + ... + 4713344.

It is an arithmetic number, because the mean of its divisors is an integer number (56559864).

Almost surely, 2^216812789 is an apocalyptic number.

It is an amenable number.

216812789 is a deficient number, since it is larger than the sum of its proper divisors (9426667).

216812789 is an equidigital number, since it uses as much as digits as its factorization.

216812789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426666.

The product of its digits is 96768, while the sum is 44.

The square root of 216812789 is about 14724.5641361638. The cubic root of 216812789 is about 600.7516404087.

The spelling of 216812789 in words is "two hundred sixteen million, eight hundred twelve thousand, seven hundred eighty-nine".