216324461 has 2 divisors, whose sum is σ = 216324462. Its totient is φ = 216324460.

The previous prime is 216324457. The next prime is 216324463. The reversal of 216324461 is 164423612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215179561 + 1144900 = 14669^2 + 1070^2 .

It is a cyclic number.

It is not a de Polignac number, because 216324461 - 2² = 216324457 is a prime.

Together with 216324463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216324463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108162230 + 108162231.

It is an arithmetic number, because the mean of its divisors is an integer number (108162231).

Almost surely, 2^216324461 is an apocalyptic number.

It is an amenable number.

216324461 is a deficient number, since it is larger than the sum of its proper divisors (1).

216324461 is an equidigital number, since it uses as much as digits as its factorization.

216324461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 29.

The square root of 216324461 is about 14707.9727019056. The cubic root of 216324461 is about 600.3002765501.

The spelling of 216324461 in words is "two hundred sixteen million, three hundred twenty-four thousand, four hundred sixty-one".