216783923 has 2 divisors, whose sum is σ = 216783924. Its totient is φ = 216783922.

The previous prime is 216783883. The next prime is 216783953. The reversal of 216783923 is 329387612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216783923 - 2⁶ = 216783859 is a prime.

It is not a weakly prime, because it can be changed into another prime (216783953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108391961 + 108391962.

It is an arithmetic number, because the mean of its divisors is an integer number (108391962).

Almost surely, 2^216783923 is an apocalyptic number.

216783923 is a deficient number, since it is larger than the sum of its proper divisors (1).

216783923 is an equidigital number, since it uses as much as digits as its factorization.

216783923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 216783923 is about 14723.5839047428. The cubic root of 216783923 is about 600.7249782876.

The spelling of 216783923 in words is "two hundred sixteen million, seven hundred eighty-three thousand, nine hundred twenty-three".