216320523 has 4 divisors (see below), whose sum is σ = 288427368. Its totient is φ = 144213680.

The previous prime is 216320479. The next prime is 216320539. The reversal of 216320523 is 325023612.

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

It is a cyclic number.

It is not a de Polignac number, because 216320523 - 2⁶ = 216320459 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216320493 and 216320502.

It is not an unprimeable number, because it can be changed into a prime (216320593) 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, 36053418 + ... + 36053423.

It is an arithmetic number, because the mean of its divisors is an integer number (72106842).

Almost surely, 2^216320523 is an apocalyptic number.

216320523 is a deficient number, since it is larger than the sum of its proper divisors (72106845).

216320523 is an equidigital number, since it uses as much as digits as its factorization.

216320523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72106844.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 216320523 is about 14707.8388283255. The cubic root of 216320523 is about 600.2966338786.

The spelling of 216320523 in words is "two hundred sixteen million, three hundred twenty thousand, five hundred twenty-three".