216771587 has 2 divisors, whose sum is σ = 216771588. Its totient is φ = 216771586.

The previous prime is 216771571. The next prime is 216771631. The reversal of 216771587 is 785177612.

216771587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (216771631) can be obtained adding 216771587 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216771587 - 2⁴ = 216771571 is a prime.

It is not a weakly prime, because it can be changed into another prime (216771517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108385793 + 108385794.

It is an arithmetic number, because the mean of its divisors is an integer number (108385794).

Almost surely, 2^216771587 is an apocalyptic number.

216771587 is a deficient number, since it is larger than the sum of its proper divisors (1).

216771587 is an equidigital number, since it uses as much as digits as its factorization.

216771587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 164640, while the sum is 44.

The square root of 216771587 is about 14723.1649790390. The cubic root of 216771587 is about 600.7135834022.

The spelling of 216771587 in words is "two hundred sixteen million, seven hundred seventy-one thousand, five hundred eighty-seven".