216056569 has 2 divisors, whose sum is σ = 216056570. Its totient is φ = 216056568.

The previous prime is 216056563. The next prime is 216056573. The reversal of 216056569 is 965650612.

216056569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215737344 + 319225 = 14688^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 216056569 - 2⁵ = 216056537 is a prime.

It is a super-2 number, since 2×216056569² = 93360882016103522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216056563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108028284 + 108028285.

It is an arithmetic number, because the mean of its divisors is an integer number (108028285).

Almost surely, 2^216056569 is an apocalyptic number.

It is an amenable number.

216056569 is a deficient number, since it is larger than the sum of its proper divisors (1).

216056569 is an equidigital number, since it uses as much as digits as its factorization.

216056569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 216056569 is about 14698.8628471729. The cubic root of 216056569 is about 600.0523741318.

The spelling of 216056569 in words is "two hundred sixteen million, fifty-six thousand, five hundred sixty-nine".