216518383 has 2 divisors, whose sum is σ = 216518384. Its totient is φ = 216518382.

The previous prime is 216518371. The next prime is 216518387. The reversal of 216518383 is 383815612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216518383 - 2¹³ = 216510191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216518387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108259191 + 108259192.

It is an arithmetic number, because the mean of its divisors is an integer number (108259192).

Almost surely, 2^216518383 is an apocalyptic number.

216518383 is a deficient number, since it is larger than the sum of its proper divisors (1).

216518383 is an equidigital number, since it uses as much as digits as its factorization.

216518383 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 216518383 is about 14714.5636360716. The cubic root of 216518383 is about 600.4796007956.

The spelling of 216518383 in words is "two hundred sixteen million, five hundred eighteen thousand, three hundred eighty-three".