321445513 has 4 divisors (see below), whose sum is σ = 321495700. Its totient is φ = 321395328.

The previous prime is 321445507. The next prime is 321445517. The reversal of 321445513 is 315544123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315544123 = 17 ⋅18561419.

It can be written as a sum of positive squares in 2 ways, for example, as 167883849 + 153561664 = 12957^2 + 12392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321445513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321445517) 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, 13788 + ... + 28861.

It is an arithmetic number, because the mean of its divisors is an integer number (80373925).

Almost surely, 2^321445513 is an apocalyptic number.

It is an amenable number.

321445513 is a deficient number, since it is larger than the sum of its proper divisors (50187).

321445513 is an equidigital number, since it uses as much as digits as its factorization.

321445513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50186.

The product of its digits is 7200, while the sum is 28.

The square root of 321445513 is about 17928.9016116437. The cubic root of 321445513 is about 685.0187452913.

Adding to 321445513 its reverse (315544123), we get a palindrome (636989636).

The spelling of 321445513 in words is "three hundred twenty-one million, four hundred forty-five thousand, five hundred thirteen".