216633841 has 2 divisors, whose sum is σ = 216633842. Its totient is φ = 216633840.

The previous prime is 216633821. The next prime is 216633869. The reversal of 216633841 is 148336612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118722816 + 97911025 = 10896^2 + 9895^2 .

It is a cyclic number.

It is not a de Polignac number, because 216633841 - 2¹³ = 216625649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216633797 and 216633806.

It is not a weakly prime, because it can be changed into another prime (216633821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108316920 + 108316921.

It is an arithmetic number, because the mean of its divisors is an integer number (108316921).

Almost surely, 2^216633841 is an apocalyptic number.

It is an amenable number.

216633841 is a deficient number, since it is larger than the sum of its proper divisors (1).

216633841 is an equidigital number, since it uses as much as digits as its factorization.

216633841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 216633841 is about 14718.4863691889. The cubic root of 216633841 is about 600.5863166828.

The spelling of 216633841 in words is "two hundred sixteen million, six hundred thirty-three thousand, eight hundred forty-one".