216056437 has 2 divisors, whose sum is σ = 216056438. Its totient is φ = 216056436.

The previous prime is 216056333. The next prime is 216056447. The reversal of 216056437 is 734650612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128278276 + 87778161 = 11326^2 + 9369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216056437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216056447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108028218 + 108028219.

It is an arithmetic number, because the mean of its divisors is an integer number (108028219).

Almost surely, 2^216056437 is an apocalyptic number.

It is an amenable number.

216056437 is a deficient number, since it is larger than the sum of its proper divisors (1).

216056437 is an equidigital number, since it uses as much as digits as its factorization.

216056437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 216056437 is about 14698.8583570290. The cubic root of 216056437 is about 600.0522519309.

The spelling of 216056437 in words is "two hundred sixteen million, fifty-six thousand, four hundred thirty-seven".