216551263 has 2 divisors, whose sum is σ = 216551264. Its totient is φ = 216551262.

The previous prime is 216551261. The next prime is 216551339. The reversal of 216551263 is 362155612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216551263 - 2¹ = 216551261 is a prime.

Together with 216551261, 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 (216551261) 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, 108275631 + 108275632.

It is an arithmetic number, because the mean of its divisors is an integer number (108275632).

Almost surely, 2^216551263 is an apocalyptic number.

216551263 is a deficient number, since it is larger than the sum of its proper divisors (1).

216551263 is an equidigital number, since it uses as much as digits as its factorization.

216551263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 31.

The square root of 216551263 is about 14715.6808541093. The cubic root of 216551263 is about 600.5099950892.

The spelling of 216551263 in words is "two hundred sixteen million, five hundred fifty-one thousand, two hundred sixty-three".