216662587 has 2 divisors, whose sum is σ = 216662588. Its totient is φ = 216662586.

The previous prime is 216662581. The next prime is 216662591. The reversal of 216662587 is 785266612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216662587 is a prime.

It is not a weakly prime, because it can be changed into another prime (216662581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108331293 + 108331294.

It is an arithmetic number, because the mean of its divisors is an integer number (108331294).

Almost surely, 2^216662587 is an apocalyptic number.

216662587 is a deficient number, since it is larger than the sum of its proper divisors (1).

216662587 is an equidigital number, since it uses as much as digits as its factorization.

216662587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 216662587 is about 14719.4628638412. The cubic root of 216662587 is about 600.6128802314.

The spelling of 216662587 in words is "two hundred sixteen million, six hundred sixty-two thousand, five hundred eighty-seven".