216737813 has 2 divisors, whose sum is σ = 216737814. Its totient is φ = 216737812.

The previous prime is 216737761. The next prime is 216737839. The reversal of 216737813 is 318737612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216737284 + 529 = 14722^2 + 23^2 .

It is a cyclic number.

It is not a de Polignac number, because 216737813 - 2¹⁰ = 216736789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216737113) 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, 108368906 + 108368907.

It is an arithmetic number, because the mean of its divisors is an integer number (108368907).

Almost surely, 2^216737813 is an apocalyptic number.

It is an amenable number.

216737813 is a deficient number, since it is larger than the sum of its proper divisors (1).

216737813 is an equidigital number, since it uses as much as digits as its factorization.

216737813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 216737813 is about 14722.0179662980. The cubic root of 216737813 is about 600.6823838115.

The spelling of 216737813 in words is "two hundred sixteen million, seven hundred thirty-seven thousand, eight hundred thirteen".