216785533 has 2 divisors, whose sum is σ = 216785534. Its totient is φ = 216785532.

The previous prime is 216785519. The next prime is 216785549. The reversal of 216785533 is 335587612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175350564 + 41434969 = 13242^2 + 6437^2 .

It is a cyclic number.

It is not a de Polignac number, because 216785533 - 2⁵ = 216785501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216785563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108392766 + 108392767.

It is an arithmetic number, because the mean of its divisors is an integer number (108392767).

Almost surely, 2^216785533 is an apocalyptic number.

It is an amenable number.

216785533 is a deficient number, since it is larger than the sum of its proper divisors (1).

216785533 is an equidigital number, since it uses as much as digits as its factorization.

216785533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 40.

The square root of 216785533 is about 14723.6385788296. The cubic root of 216785533 is about 600.7264654287.

The spelling of 216785533 in words is "two hundred sixteen million, seven hundred eighty-five thousand, five hundred thirty-three".