216362191 has 2 divisors, whose sum is σ = 216362192. Its totient is φ = 216362190.

The previous prime is 216362183. The next prime is 216362261. The reversal of 216362191 is 191263612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216362191 - 2³ = 216362183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216362141) 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, 108181095 + 108181096.

It is an arithmetic number, because the mean of its divisors is an integer number (108181096).

Almost surely, 2^216362191 is an apocalyptic number.

216362191 is a deficient number, since it is larger than the sum of its proper divisors (1).

216362191 is an equidigital number, since it uses as much as digits as its factorization.

216362191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 216362191 is about 14709.2552836641. The cubic root of 216362191 is about 600.3351747653.

The spelling of 216362191 in words is "two hundred sixteen million, three hundred sixty-two thousand, one hundred ninety-one".