321313513 has 8 divisors (see below), whose sum is σ = 330228360. Its totient is φ = 312410880.

The previous prime is 321313477. The next prime is 321313523. The reversal of 321313513 is 315313123.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 157678249 + 163635264 = 12557^2 + 12792^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321313513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321313523) 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, 83553 + ... + 87313.

It is an arithmetic number, because the mean of its divisors is an integer number (41278545).

Almost surely, 2^321313513 is an apocalyptic number.

It is an amenable number.

321313513 is a deficient number, since it is larger than the sum of its proper divisors (8914847).

321313513 is a wasteful number, since it uses less digits than its factorization.

321313513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6107.

The product of its digits is 810, while the sum is 22.

The square root of 321313513 is about 17925.2200265436. The cubic root of 321313513 is about 684.9249659407.

Adding to 321313513 its reverse (315313123), we get a palindrome (636626636).

The spelling of 321313513 in words is "three hundred twenty-one million, three hundred thirteen thousand, five hundred thirteen".