216983399 has 2 divisors, whose sum is σ = 216983400. Its totient is φ = 216983398.

The previous prime is 216983383. The next prime is 216983509. The reversal of 216983399 is 993389612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216983399 - 2⁴ = 216983383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216983339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108491699 + 108491700.

It is an arithmetic number, because the mean of its divisors is an integer number (108491700).

Almost surely, 2^216983399 is an apocalyptic number.

216983399 is a deficient number, since it is larger than the sum of its proper divisors (1).

216983399 is an equidigital number, since it uses as much as digits as its factorization.

216983399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 50.

The square root of 216983399 is about 14730.3563772232. The cubic root of 216983399 is about 600.9091762646.

The spelling of 216983399 in words is "two hundred sixteen million, nine hundred eighty-three thousand, three hundred ninety-nine".