216497227 has 4 divisors (see below), whose sum is σ = 229232376. Its totient is φ = 203762080.

The previous prime is 216497219. The next prime is 216497233. The reversal of 216497227 is 722794612.

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 216497227 - 2³ = 216497219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216497227.

It is not an unprimeable number, because it can be changed into a prime (216497257) 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 in 3 ways as a sum of consecutive naturals, for example, 6367549 + ... + 6367582.

It is an arithmetic number, because the mean of its divisors is an integer number (57308094).

Almost surely, 2^216497227 is an apocalyptic number.

216497227 is a deficient number, since it is larger than the sum of its proper divisors (12735149).

216497227 is a wasteful number, since it uses less digits than its factorization.

216497227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12735148.

The product of its digits is 84672, while the sum is 40.

The square root of 216497227 is about 14713.8447388845. The cubic root of 216497227 is about 600.4600425483.

The spelling of 216497227 in words is "two hundred sixteen million, four hundred ninety-seven thousand, two hundred twenty-seven".