216765841 has 2 divisors, whose sum is σ = 216765842. Its totient is φ = 216765840.

The previous prime is 216765821. The next prime is 216765863. The reversal of 216765841 is 148567612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203661441 + 13104400 = 14271^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 216765841 - 2¹¹ = 216763793 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216765794 and 216765803.

It is not a weakly prime, because it can be changed into another prime (216765821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108382920 + 108382921.

It is an arithmetic number, because the mean of its divisors is an integer number (108382921).

Almost surely, 2^216765841 is an apocalyptic number.

It is an amenable number.

216765841 is a deficient number, since it is larger than the sum of its proper divisors (1).

216765841 is an equidigital number, since it uses as much as digits as its factorization.

216765841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 216765841 is about 14722.9698430717. The cubic root of 216765841 is about 600.7082756175.

The spelling of 216765841 in words is "two hundred sixteen million, seven hundred sixty-five thousand, eight hundred forty-one".