216263689 has 2 divisors, whose sum is σ = 216263690. Its totient is φ = 216263688.

The previous prime is 216263669. The next prime is 216263699. The reversal of 216263689 is 986362612.

216263689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 209294089 + 6969600 = 14467^2 + 2640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216263689 is a prime.

It is not a weakly prime, because it can be changed into another prime (216263609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108131844 + 108131845.

It is an arithmetic number, because the mean of its divisors is an integer number (108131845).

Almost surely, 2^216263689 is an apocalyptic number.

It is an amenable number.

216263689 is a deficient number, since it is larger than the sum of its proper divisors (1).

216263689 is an equidigital number, since it uses as much as digits as its factorization.

216263689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 43.

The square root of 216263689 is about 14705.9066024506. The cubic root of 216263689 is about 600.2440571948.

The spelling of 216263689 in words is "two hundred sixteen million, two hundred sixty-three thousand, six hundred eighty-nine".