216657227 has 2 divisors, whose sum is σ = 216657228. Its totient is φ = 216657226.

The previous prime is 216657223. The next prime is 216657253. The reversal of 216657227 is 722756612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216657227 - 2² = 216657223 is a prime.

It is a super-2 number, since 2×216657227² = 93880708022659058, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216657223) 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, 108328613 + 108328614.

It is an arithmetic number, because the mean of its divisors is an integer number (108328614).

Almost surely, 2^216657227 is an apocalyptic number.

216657227 is a deficient number, since it is larger than the sum of its proper divisors (1).

216657227 is an equidigital number, since it uses as much as digits as its factorization.

216657227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The square root of 216657227 is about 14719.2807908539. The cubic root of 216657227 is about 600.6079273510.

The spelling of 216657227 in words is "two hundred sixteen million, six hundred fifty-seven thousand, two hundred twenty-seven".