3216505 has 4 divisors (see below), whose sum is σ = 3859812. Its totient is φ = 2573200.

The previous prime is 3216497. The next prime is 3216509. The reversal of 3216505 is 5056123.

It is a happy number.

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 2334784 + 881721 = 1528^2 + 939^2 .

It is not a de Polignac number, because 3216505 - 2³ = 3216497 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3216509) 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, 321646 + ... + 321655.

It is an arithmetic number, because the mean of its divisors is an integer number (964953).

Almost surely, 2^3216505 is an apocalyptic number.

It is an amenable number.

3216505 is a deficient number, since it is larger than the sum of its proper divisors (643307).

3216505 is an equidigital number, since it uses as much as digits as its factorization.

3216505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643306.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 3216505 is about 1793.4617364193. The cubic root of 3216505 is about 147.6141795217.

It can be divided in two parts, 3216 and 505, that added together give a square (3721 = 61²).

The spelling of 3216505 in words is "three million, two hundred sixteen thousand, five hundred five".