216244591 has 2 divisors, whose sum is σ = 216244592. Its totient is φ = 216244590.

The previous prime is 216244583. The next prime is 216244601. The reversal of 216244591 is 195442612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216244591 - 2³ = 216244583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216244531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108122295 + 108122296.

It is an arithmetic number, because the mean of its divisors is an integer number (108122296).

Almost surely, 2^216244591 is an apocalyptic number.

216244591 is a deficient number, since it is larger than the sum of its proper divisors (1).

216244591 is an equidigital number, since it uses as much as digits as its factorization.

216244591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 216244591 is about 14705.2572571853. The cubic root of 216244591 is about 600.2263877184.

The spelling of 216244591 in words is "two hundred sixteen million, two hundred forty-four thousand, five hundred ninety-one".