216732533 has 4 divisors (see below), whose sum is σ = 219167820. Its totient is φ = 214297248.

The previous prime is 216732499. The next prime is 216732539. The reversal of 216732533 is 335237612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123165604 + 93566929 = 11098^2 + 9673^2 .

It is a cyclic number.

It is not a de Polignac number, because 216732533 - 2¹² = 216728437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216732533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216732539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1217510 + ... + 1217687.

It is an arithmetic number, because the mean of its divisors is an integer number (54791955).

Almost surely, 2^216732533 is an apocalyptic number.

It is an amenable number.

216732533 is a deficient number, since it is larger than the sum of its proper divisors (2435287).

216732533 is an equidigital number, since it uses as much as digits as its factorization.

216732533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435286.

The product of its digits is 22680, while the sum is 32.

The square root of 216732533 is about 14721.8386419632. The cubic root of 216732533 is about 600.6775059844.

The spelling of 216732533 in words is "two hundred sixteen million, seven hundred thirty-two thousand, five hundred thirty-three".