216986867 has 2 divisors, whose sum is σ = 216986868. Its totient is φ = 216986866.

The previous prime is 216986813. The next prime is 216986881. The reversal of 216986867 is 768689612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216986867 - 2¹² = 216982771 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216986467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108493433 + 108493434.

It is an arithmetic number, because the mean of its divisors is an integer number (108493434).

Almost surely, 2^216986867 is an apocalyptic number.

216986867 is a deficient number, since it is larger than the sum of its proper divisors (1).

216986867 is an equidigital number, since it uses as much as digits as its factorization.

216986867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The square root of 216986867 is about 14730.4740928458. The cubic root of 216986867 is about 600.9123776492.

The spelling of 216986867 in words is "two hundred sixteen million, nine hundred eighty-six thousand, eight hundred sixty-seven".