216006517 has 2 divisors, whose sum is σ = 216006518. Its totient is φ = 216006516.

The previous prime is 216006503. The next prime is 216006521. The reversal of 216006517 is 715600612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121022001 + 94984516 = 11001^2 + 9746^2 .

It is a cyclic number.

It is not a de Polignac number, because 216006517 - 2²³ = 207617909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216003517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108003258 + 108003259.

It is an arithmetic number, because the mean of its divisors is an integer number (108003259).

Almost surely, 2^216006517 is an apocalyptic number.

It is an amenable number.

216006517 is a deficient number, since it is larger than the sum of its proper divisors (1).

216006517 is an equidigital number, since it uses as much as digits as its factorization.

216006517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 216006517 is about 14697.1601678692. The cubic root of 216006517 is about 600.0060341986.

The spelling of 216006517 in words is "two hundred sixteen million, six thousand, five hundred seventeen".