216731033 has 2 divisors, whose sum is σ = 216731034. Its totient is φ = 216731032.

The previous prime is 216731023. The next prime is 216731041. The reversal of 216731033 is 330137612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216325264 + 405769 = 14708^2 + 637^2 .

It is a cyclic number.

It is not a de Polignac number, because 216731033 - 2¹⁰ = 216730009 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216730993 and 216731011.

It is not a weakly prime, because it can be changed into another prime (216731003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108365516 + 108365517.

It is an arithmetic number, because the mean of its divisors is an integer number (108365517).

Almost surely, 2^216731033 is an apocalyptic number.

It is an amenable number.

216731033 is a deficient number, since it is larger than the sum of its proper divisors (1).

216731033 is an equidigital number, since it uses as much as digits as its factorization.

216731033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 216731033 is about 14721.7876971515. The cubic root of 216731033 is about 600.6761202236.

Adding to 216731033 its reverse (330137612), we get a palindrome (546868645).

The spelling of 216731033 in words is "two hundred sixteen million, seven hundred thirty-one thousand, thirty-three".