216533687 has 2 divisors, whose sum is σ = 216533688. Its totient is φ = 216533686.

The previous prime is 216533683. The next prime is 216533701. The reversal of 216533687 is 786335612.

216533687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216533687 - 2² = 216533683 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216533683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108266843 + 108266844.

It is an arithmetic number, because the mean of its divisors is an integer number (108266844).

Almost surely, 2^216533687 is an apocalyptic number.

216533687 is a deficient number, since it is larger than the sum of its proper divisors (1).

216533687 is an equidigital number, since it uses as much as digits as its factorization.

216533687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 41.

The square root of 216533687 is about 14715.0836558954. The cubic root of 216533687 is about 600.4937482060.

The spelling of 216533687 in words is "two hundred sixteen million, five hundred thirty-three thousand, six hundred eighty-seven".