216443533 has 2 divisors, whose sum is σ = 216443534. Its totient is φ = 216443532.

The previous prime is 216443471. The next prime is 216443537. The reversal of 216443533 is 335344612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210308004 + 6135529 = 14502^2 + 2477^2 .

It is a cyclic number.

It is not a de Polignac number, because 216443533 - 2²¹ = 214346381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216443495 and 216443504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216443537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108221766 + 108221767.

It is an arithmetic number, because the mean of its divisors is an integer number (108221767).

Almost surely, 2^216443533 is an apocalyptic number.

It is an amenable number.

216443533 is a deficient number, since it is larger than the sum of its proper divisors (1).

216443533 is an equidigital number, since it uses as much as digits as its factorization.

216443533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 31.

The square root of 216443533 is about 14712.0200176590. The cubic root of 216443533 is about 600.4103979289.

The spelling of 216443533 in words is "two hundred sixteen million, four hundred forty-three thousand, five hundred thirty-three".