216548317 has 4 divisors (see below), whose sum is σ = 221155776. Its totient is φ = 211940860.

The previous prime is 216548287. The next prime is 216548323. The reversal of 216548317 is 713845612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-216548317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216548327) 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, 2303659 + ... + 2303752.

It is an arithmetic number, because the mean of its divisors is an integer number (55288944).

Almost surely, 2^216548317 is an apocalyptic number.

It is an amenable number.

216548317 is a deficient number, since it is larger than the sum of its proper divisors (4607459).

216548317 is an equidigital number, since it uses as much as digits as its factorization.

216548317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4607458.

The product of its digits is 40320, while the sum is 37.

The square root of 216548317 is about 14715.5807564635. The cubic root of 216548317 is about 600.5072719304.

The spelling of 216548317 in words is "two hundred sixteen million, five hundred forty-eight thousand, three hundred seventeen".