216443471 has 2 divisors, whose sum is σ = 216443472. Its totient is φ = 216443470.

The previous prime is 216443449. The next prime is 216443533. The reversal of 216443471 is 174344612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216443471 - 2⁶ = 216443407 is a prime.

It is a super-3 number, since 3×216443471³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216443401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108221735 + 108221736.

It is an arithmetic number, because the mean of its divisors is an integer number (108221736).

Almost surely, 2^216443471 is an apocalyptic number.

216443471 is a deficient number, since it is larger than the sum of its proper divisors (1).

216443471 is an equidigital number, since it uses as much as digits as its factorization.

216443471 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 32.

The square root of 216443471 is about 14712.0179105383. The cubic root of 216443471 is about 600.4103406000.

The spelling of 216443471 in words is "two hundred sixteen million, four hundred forty-three thousand, four hundred seventy-one".