313031321 has 8 divisors (see below), whose sum is σ = 319566600. Its totient is φ = 306541440.

The previous prime is 313031293. The next prime is 313031333. The reversal of 313031321 is 123130313.

It can be written as a sum of positive squares in 4 ways, for example, as 43414921 + 269616400 = 6589^2 + 16420^2 .

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-313031321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 313031321.

It is not an unprimeable number, because it can be changed into a prime (313031021) 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, 2765 + ... + 25173.

It is an arithmetic number, because the mean of its divisors is an integer number (39945825).

Almost surely, 2^313031321 is an apocalyptic number.

It is an amenable number.

313031321 is a deficient number, since it is larger than the sum of its proper divisors (6535279).

313031321 is a wasteful number, since it uses less digits than its factorization.

313031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22699.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 313031321 is about 17692.6911746065. The cubic root of 313031321 is about 678.9887802774.

Adding to 313031321 its reverse (123130313), we get a palindrome (436161634).

The spelling of 313031321 in words is "three hundred thirteen million, thirty-one thousand, three hundred twenty-one".