216444587 has 2 divisors, whose sum is σ = 216444588. Its totient is φ = 216444586.

The previous prime is 216444551. The next prime is 216444593. The reversal of 216444587 is 785444612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216444587 - 2²⁶ = 149335723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216444887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108222293 + 108222294.

It is an arithmetic number, because the mean of its divisors is an integer number (108222294).

Almost surely, 2^216444587 is an apocalyptic number.

216444587 is a deficient number, since it is larger than the sum of its proper divisors (1).

216444587 is an equidigital number, since it uses as much as digits as its factorization.

216444587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 41.

The square root of 216444587 is about 14712.0558386651. The cubic root of 216444587 is about 600.4113725196.

The spelling of 216444587 in words is "two hundred sixteen million, four hundred forty-four thousand, five hundred eighty-seven".