216826117 has 2 divisors, whose sum is σ = 216826118. Its totient is φ = 216826116.

The previous prime is 216826097. The next prime is 216826123. The reversal of 216826117 is 711628612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205033761 + 11792356 = 14319^2 + 3434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216826117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216826217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108413058 + 108413059.

It is an arithmetic number, because the mean of its divisors is an integer number (108413059).

Almost surely, 2^216826117 is an apocalyptic number.

It is an amenable number.

216826117 is a deficient number, since it is larger than the sum of its proper divisors (1).

216826117 is an equidigital number, since it uses as much as digits as its factorization.

216826117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 216826117 is about 14725.0167062724. The cubic root of 216826117 is about 600.7639500359.

The spelling of 216826117 in words is "two hundred sixteen million, eight hundred twenty-six thousand, one hundred seventeen".