216530569 has 2 divisors, whose sum is σ = 216530570. Its totient is φ = 216530568.

The previous prime is 216530537. The next prime is 216530609. The reversal of 216530569 is 965035612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202692169 + 13838400 = 14237^2 + 3720^2 .

It is a cyclic number.

It is not a de Polignac number, because 216530569 - 2⁵ = 216530537 is a prime.

It is a super-2 number, since 2×216530569² = 93770974622927522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216534569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108265284 + 108265285.

It is an arithmetic number, because the mean of its divisors is an integer number (108265285).

Almost surely, 2^216530569 is an apocalyptic number.

It is an amenable number.

216530569 is a deficient number, since it is larger than the sum of its proper divisors (1).

216530569 is an equidigital number, since it uses as much as digits as its factorization.

216530569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 37.

The square root of 216530569 is about 14714.9777098030. The cubic root of 216530569 is about 600.4908659009.

The spelling of 216530569 in words is "two hundred sixteen million, five hundred thirty thousand, five hundred sixty-nine".