216354899 has 4 divisors (see below), whose sum is σ = 218455536. Its totient is φ = 214254264.

The previous prime is 216354893. The next prime is 216354967. The reversal of 216354899 is 998453612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216354899 - 2⁴ = 216354883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216354893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050164 + ... + 1050369.

It is an arithmetic number, because the mean of its divisors is an integer number (54613884).

Almost surely, 2^216354899 is an apocalyptic number.

216354899 is a deficient number, since it is larger than the sum of its proper divisors (2100637).

216354899 is a wasteful number, since it uses less digits than its factorization.

216354899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100636.

The product of its digits is 466560, while the sum is 47.

The square root of 216354899 is about 14709.0074104271. The cubic root of 216354899 is about 600.3284303749.

The spelling of 216354899 in words is "two hundred sixteen million, three hundred fifty-four thousand, eight hundred ninety-nine".