216268447 has 2 divisors, whose sum is σ = 216268448. Its totient is φ = 216268446.

The previous prime is 216268439. The next prime is 216268499. The reversal of 216268447 is 744862612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216268447 - 2³ = 216268439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216268417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108134223 + 108134224.

It is an arithmetic number, because the mean of its divisors is an integer number (108134224).

Almost surely, 2^216268447 is an apocalyptic number.

216268447 is a deficient number, since it is larger than the sum of its proper divisors (1).

216268447 is an equidigital number, since it uses as much as digits as its factorization.

216268447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 40.

The square root of 216268447 is about 14706.0683732941. The cubic root of 216268447 is about 600.2484591363.

The spelling of 216268447 in words is "two hundred sixteen million, two hundred sixty-eight thousand, four hundred forty-seven".