216323593 has 4 divisors (see below), whose sum is σ = 216356868. Its totient is φ = 216290320.

The previous prime is 216323573. The next prime is 216323599. The reversal of 216323593 is 395323612.

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 146216464 + 70107129 = 12092^2 + 8373^2 .

It is a cyclic number.

It is not a de Polignac number, because 216323593 - 2⁵ = 216323561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216323599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3346 + ... + 21067.

It is an arithmetic number, because the mean of its divisors is an integer number (54089217).

Almost surely, 2^216323593 is an apocalyptic number.

It is an amenable number.

216323593 is a deficient number, since it is larger than the sum of its proper divisors (33275).

216323593 is an equidigital number, since it uses as much as digits as its factorization.

216323593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33274.

The product of its digits is 29160, while the sum is 34.

The square root of 216323593 is about 14707.9431940703. The cubic root of 216323593 is about 600.2994736492.

The spelling of 216323593 in words is "two hundred sixteen million, three hundred twenty-three thousand, five hundred ninety-three".