216544513 has 4 divisors (see below), whose sum is σ = 216574128. Its totient is φ = 216514900.

The previous prime is 216544511. The next prime is 216544547. The reversal of 216544513 is 315445612.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 216544513 - 2¹ = 216544511 is a prime.

It is a super-2 number, since 2×216544513² = 93783052220814338, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216544511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4938 + ... + 21388.

It is an arithmetic number, because the mean of its divisors is an integer number (54143532).

Almost surely, 2^216544513 is an apocalyptic number.

It is an amenable number.

216544513 is a deficient number, since it is larger than the sum of its proper divisors (29615).

216544513 is a wasteful number, since it uses less digits than its factorization.

216544513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29614.

The product of its digits is 14400, while the sum is 31.

The square root of 216544513 is about 14715.4515051357. The cubic root of 216544513 is about 600.5037556358.

The spelling of 216544513 in words is "two hundred sixteen million, five hundred forty-four thousand, five hundred thirteen".