216243037 has 2 divisors, whose sum is σ = 216243038. Its totient is φ = 216243036.

The previous prime is 216243031. The next prime is 216243089. The reversal of 216243037 is 730342612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138556441 + 77686596 = 11771^2 + 8814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216243037 is a prime.

It is a super-2 number, since 2×216243037² = 93522102101966738, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216242996 and 216243014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216243031) 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, 108121518 + 108121519.

It is an arithmetic number, because the mean of its divisors is an integer number (108121519).

Almost surely, 2^216243037 is an apocalyptic number.

It is an amenable number.

216243037 is a deficient number, since it is larger than the sum of its proper divisors (1).

216243037 is an equidigital number, since it uses as much as digits as its factorization.

216243037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 216243037 is about 14705.2044188444. The cubic root of 216243037 is about 600.2249499113.

Adding to 216243037 its reverse (730342612), we get a palindrome (946585649).

It can be divided in two parts, 216 and 243037, that added together give a triangular number (243253 = T₆₉₇).

The spelling of 216243037 in words is "two hundred sixteen million, two hundred forty-three thousand, thirty-seven".