216855071 has 2 divisors, whose sum is σ = 216855072. Its totient is φ = 216855070.

The previous prime is 216855059. The next prime is 216855091. The reversal of 216855071 is 170558612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216855071 - 2¹⁰ = 216854047 is a prime.

It is a super-2 number, since 2×216855071² = 94052243636830082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216855091) 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, 108427535 + 108427536.

It is an arithmetic number, because the mean of its divisors is an integer number (108427536).

Almost surely, 2^216855071 is an apocalyptic number.

216855071 is a deficient number, since it is larger than the sum of its proper divisors (1).

216855071 is an equidigital number, since it uses as much as digits as its factorization.

216855071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 216855071 is about 14725.9998302322. Note that the first 3 decimals coincide. The cubic root of 216855071 is about 600.7906899653.

The spelling of 216855071 in words is "two hundred sixteen million, eight hundred fifty-five thousand, seventy-one".