216526417 has 2 divisors, whose sum is σ = 216526418. Its totient is φ = 216526416.

The previous prime is 216526403. The next prime is 216526421. The reversal of 216526417 is 714625612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216413521 + 112896 = 14711^2 + 336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216526417 is a prime.

It is not a weakly prime, because it can be changed into another prime (216526487) 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, 108263208 + 108263209.

It is an arithmetic number, because the mean of its divisors is an integer number (108263209).

Almost surely, 2^216526417 is an apocalyptic number.

It is an amenable number.

216526417 is a deficient number, since it is larger than the sum of its proper divisors (1).

216526417 is an equidigital number, since it uses as much as digits as its factorization.

216526417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 216526417 is about 14714.8366283829. The cubic root of 216526417 is about 600.4870277145.

It can be divided in two parts, 2165 and 26417, that added together give a palindrome (28582).

The spelling of 216526417 in words is "two hundred sixteen million, five hundred twenty-six thousand, four hundred seventeen".