216733331 has 2 divisors, whose sum is σ = 216733332. Its totient is φ = 216733330.

The previous prime is 216733313. The next prime is 216733381. The reversal of 216733331 is 133337612.

Together with previous prime (216733313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216733331 - 2⁶ = 216733267 is a prime.

It is a super-2 number, since 2×216733331² = 93946673532711122, 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 = 216733294 and 216733303.

It is not a weakly prime, because it can be changed into another prime (216733381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108366665 + 108366666.

It is an arithmetic number, because the mean of its divisors is an integer number (108366666).

Almost surely, 2^216733331 is an apocalyptic number.

216733331 is a deficient number, since it is larger than the sum of its proper divisors (1).

216733331 is an equidigital number, since it uses as much as digits as its factorization.

216733331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 29.

The square root of 216733331 is about 14721.8657445312. The cubic root of 216733331 is about 600.6782432065.

The spelling of 216733331 in words is "two hundred sixteen million, seven hundred thirty-three thousand, three hundred thirty-one".