216326549 has 8 divisors (see below), whose sum is σ = 220770360. Its totient is φ = 211896256.

The previous prime is 216326543. The next prime is 216326597. The reversal of 216326549 is 945623612.

216326549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 176092900 + 40233649 = 13270^2 + 6343^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216326549 - 2¹² = 216322453 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 (216326543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32867 + ... + 38895.

It is an arithmetic number, because the mean of its divisors is an integer number (27596295).

Almost surely, 2^216326549 is an apocalyptic number.

It is an amenable number.

216326549 is a deficient number, since it is larger than the sum of its proper divisors (4443811).

216326549 is an equidigital number, since it uses as much as digits as its factorization.

216326549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6759.

The product of its digits is 77760, while the sum is 38.

The square root of 216326549 is about 14708.0436836447. The cubic root of 216326549 is about 600.3022079436.

The spelling of 216326549 in words is "two hundred sixteen million, three hundred twenty-six thousand, five hundred forty-nine".