216562069 has 2 divisors, whose sum is σ = 216562070. Its totient is φ = 216562068.

The previous prime is 216562067. The next prime is 216562097. The reversal of 216562069 is 960265612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154703844 + 61858225 = 12438^2 + 7865^2 .

It is a cyclic number.

It is not a de Polignac number, because 216562069 - 2¹ = 216562067 is a prime.

It is a super-2 number, since 2×216562069² = 93798259459121522, which contains 22 as substring.

Together with 216562067, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216562067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108281034 + 108281035.

It is an arithmetic number, because the mean of its divisors is an integer number (108281035).

Almost surely, 2^216562069 is an apocalyptic number.

It is an amenable number.

216562069 is a deficient number, since it is larger than the sum of its proper divisors (1).

216562069 is an equidigital number, since it uses as much as digits as its factorization.

216562069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 216562069 is about 14716.0480088915. The cubic root of 216562069 is about 600.5199834910.

The spelling of 216562069 in words is "two hundred sixteen million, five hundred sixty-two thousand, sixty-nine".