216057287 has 2 divisors, whose sum is σ = 216057288. Its totient is φ = 216057286.

The previous prime is 216057187. The next prime is 216057299. The reversal of 216057287 is 782750612.

216057287 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 is a cyclic number.

It is not a de Polignac number, because 216057287 - 2⁸ = 216057031 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216057287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216057187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108028643 + 108028644.

It is an arithmetic number, because the mean of its divisors is an integer number (108028644).

Almost surely, 2^216057287 is an apocalyptic number.

216057287 is a deficient number, since it is larger than the sum of its proper divisors (1).

216057287 is an equidigital number, since it uses as much as digits as its factorization.

216057287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 216057287 is about 14698.8872708107. The cubic root of 216057287 is about 600.0530388299.

The spelling of 216057287 in words is "two hundred sixteen million, fifty-seven thousand, two hundred eighty-seven".