216623933 has 2 divisors, whose sum is σ = 216623934. Its totient is φ = 216623932.

The previous prime is 216623917. The next prime is 216623963. The reversal of 216623933 is 339326612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186131449 + 30492484 = 13643^2 + 5522^2 .

It is a cyclic number.

It is not a de Polignac number, because 216623933 - 2⁴ = 216623917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216623893 and 216623902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216623963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108311966 + 108311967.

It is an arithmetic number, because the mean of its divisors is an integer number (108311967).

Almost surely, 2^216623933 is an apocalyptic number.

It is an amenable number.

216623933 is a deficient number, since it is larger than the sum of its proper divisors (1).

216623933 is an equidigital number, since it uses as much as digits as its factorization.

216623933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 35.

The square root of 216623933 is about 14718.1497818170. The cubic root of 216623933 is about 600.5771603726.

The spelling of 216623933 in words is "two hundred sixteen million, six hundred twenty-three thousand, nine hundred thirty-three".