216730819 has 2 divisors, whose sum is σ = 216730820. Its totient is φ = 216730818.

The previous prime is 216730799. The next prime is 216730847. The reversal of 216730819 is 918037612.

216730819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216730819 - 2²⁵ = 183176387 is a prime.

It is a super-2 number, since 2×216730819² = 93944495808821522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216730919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108365409 + 108365410.

It is an arithmetic number, because the mean of its divisors is an integer number (108365410).

Almost surely, 2^216730819 is an apocalyptic number.

216730819 is a deficient number, since it is larger than the sum of its proper divisors (1).

216730819 is an equidigital number, since it uses as much as digits as its factorization.

216730819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 216730819 is about 14721.7804290106. The cubic root of 216730819 is about 600.6759225212.

The spelling of 216730819 in words is "two hundred sixteen million, seven hundred thirty thousand, eight hundred nineteen".