216238613 has 2 divisors, whose sum is σ = 216238614. Its totient is φ = 216238612.

The previous prime is 216238597. The next prime is 216238637. The reversal of 216238613 is 316832612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170093764 + 46144849 = 13042^2 + 6793^2 .

It is a cyclic number.

It is not a de Polignac number, because 216238613 - 2⁴ = 216238597 is a prime.

It is a super-6 number, since 6×216238613⁶ (a number of 51 digits) contains 666666 as substring. Note that it is a super-d number also for d = 3.

It is a self number, because there is not a number n which added to its sum of digits gives 216238613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216238643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108119306 + 108119307.

It is an arithmetic number, because the mean of its divisors is an integer number (108119307).

Almost surely, 2^216238613 is an apocalyptic number.

It is an amenable number.

216238613 is a deficient number, since it is larger than the sum of its proper divisors (1).

216238613 is an equidigital number, since it uses as much as digits as its factorization.

216238613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 216238613 is about 14705.0539951406. The cubic root of 216238613 is about 600.2208566569.

The spelling of 216238613 in words is "two hundred sixteen million, two hundred thirty-eight thousand, six hundred thirteen".