216534517 has 2 divisors, whose sum is σ = 216534518. Its totient is φ = 216534516.

The previous prime is 216534511. The next prime is 216534523. The reversal of 216534517 is 715435612.

It is a balanced prime because it is at equal distance from previous prime (216534511) and next prime (216534523).

It can be written as a sum of positive squares in only one way, i.e., 158911236 + 57623281 = 12606^2 + 7591^2 .

It is a cyclic number.

It is not a de Polignac number, because 216534517 - 2²⁷ = 82316789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216534511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108267258 + 108267259.

It is an arithmetic number, because the mean of its divisors is an integer number (108267259).

Almost surely, 2^216534517 is an apocalyptic number.

It is an amenable number.

216534517 is a deficient number, since it is larger than the sum of its proper divisors (1).

216534517 is an equidigital number, since it uses as much as digits as its factorization.

216534517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 34.

The square root of 216534517 is about 14715.1118582225. Note that the first 3 decimals coincide. The cubic root of 216534517 is about 600.4945154603.

The spelling of 216534517 in words is "two hundred sixteen million, five hundred thirty-four thousand, five hundred seventeen".