216009799 has 2 divisors, whose sum is σ = 216009800. Its totient is φ = 216009798.

The previous prime is 216009743. The next prime is 216009817. The reversal of 216009799 is 997900612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216009799 - 2⁷ = 216009671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216009709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108004899 + 108004900.

It is an arithmetic number, because the mean of its divisors is an integer number (108004900).

Almost surely, 2^216009799 is an apocalyptic number.

216009799 is a deficient number, since it is larger than the sum of its proper divisors (1).

216009799 is an equidigital number, since it uses as much as digits as its factorization.

216009799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 216009799 is about 14697.2718216681. The cubic root of 216009799 is about 600.0090730109.

The spelling of 216009799 in words is "two hundred sixteen million, nine thousand, seven hundred ninety-nine".