216895919 has 2 divisors, whose sum is σ = 216895920. Its totient is φ = 216895918.

The previous prime is 216895907. The next prime is 216895927. The reversal of 216895919 is 919598612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216895919 - 2¹² = 216891823 is a prime.

It is a super-2 number, since 2×216895919² = 94087679357709122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216895949) 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, 108447959 + 108447960.

It is an arithmetic number, because the mean of its divisors is an integer number (108447960).

Almost surely, 2^216895919 is an apocalyptic number.

216895919 is a deficient number, since it is larger than the sum of its proper divisors (1).

216895919 is an equidigital number, since it uses as much as digits as its factorization.

216895919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 50.

The square root of 216895919 is about 14727.3866996151. The cubic root of 216895919 is about 600.8284103304.

The spelling of 216895919 in words is "two hundred sixteen million, eight hundred ninety-five thousand, nine hundred nineteen".